The Engineering Index Annual for 1910, New York: The Engineering Magazine 1911. 8vo.; 496 pp. Price, amp; dollar; 2. The headings under which this admirable index is issued comprise civil engineering, electrical engineering, industrial economy, marine and naval engineering, mechanical engineering, mining and metallurgy, railway engineering, and street and electric railways. A specialist in any one of these branches will find a collation of references to the current literature of his subject. Two hundred and fifty publications are included, representing seventeen peoples and six languages. Every entry is accompanied by a short note defining the scope and purport of the article. This, the ninth volu me, completes an index of engineering and technical literature covering twenty-six years, although the first two volumes, 1884 to 1895, are now out of print. Storage Batteries. Their Theory, Construction, and Use. By A. E. Watson, E.E., Ph.D. Lynn, Mass.: Bubier Publishing Company, 1911. 16mo.; 166 pp.; illustrated. Price, amp; dollar; 1.50. In offering a second edition of amp; ldquo; Storage Batteriesamp; rdquo; the author endeavors to give within limited space all the essential features and advantages of the modern makes of cells. He sets forth in simple language the theory of the chemical actions involved, gives his own method of making plates, tells how to set up and care for batteries, and instructs the reader as to switch-board arrangements. The lead type of cell is, dealt with almost exclusively, as being the only really efficient cell on the market. The descriptions of cells have been approved by their manulamp; apos; acturers, so that the accuracy of each description is assured. To Mars via the Moon. By Mark Wicks. Philadelphia: J. B. Lippincott Company, 1911. 8vo.; 328 pp.; illustrated. Price, amp; dollar; 1.50. The world is beginning to see that there is more romance in science and more science in romance than it has heretofore been willing to admit. Perhaps this fact is sufficient excuse for Mr. Wicksamp; apos; s attempt to take us to Mars in a flying-machine. At any rate his pleasing namrative is a medium for the conamp; rdquo; veyance of the latest discoveries and speculations concerning Mars and its mysteries, and he is to be commended for the care with which he has drawn the line between fact and fiction while sustaining at the same time the interest of both. Mr. Wicks has put himself to the trouble of constructing a number of globes reproducing the appearances of Mars at different seasons and in varying phases; the plates showing these globes make it easy to follow his description, theories, and arguments. Most people have extremely hazy ideas regarding the relati ve motions of the earth and the planets, the probable appearance of interstellar space, and the possibility of the existence of life on other worlds than our own. For this majority, sugar-coated science is not without its beneficial qualities, and such a narrative as amp; ldquo; To Mars amp; ldquo; ia the Moonamp; rdquo; will help them to a better understanding of our solar system and its marvelous machinery. Ben Stone at Oakdale. By Morgan Scott. New York: Hurstamp; amp; Co., 19ll. 8vo.; 316 pp.; illustrated. Price, 1)0 cents. Boys demand incident and action in their fiction. If the story glorifies some boy hero, amp; lt; 80 much the better. There is plenty of boy and plenty of action in amp; ldquo; Ben Stone at Oak-dale.amp; rdquo; Ben, the hero, is the proverbial dog with a had name. His plucky stand against adverse circumstances and persecution forms the substance of the While adven- tures are encountered and prodigies performed, the probabilities have not been strained to the vanishing point, the characterization is kept within the bounds of reason, and inspiration toward fair play and manliness breathes from every page. The Expert Sign Painter. By A. Ash-mun Kelly. Malvern, Pa.: A. Ashmun Kelly, 1910. 8vo.; 302 pp. As its title implies, this is a book of reference for practical sign painters and Jetter-ers. It is not a collection ot lay-outs and alpha bets, but places amp; bull; before the expert workman the varying methods of other expert workmen compiled not alone from the w fileramp; apos; s own experience, butamp; apos; from all .the published work s and current literature on the subject with which he has been able to get in touch. In the historical .sketch which introduces the subject, the writer makes mention o[ such well-known meu as Benedict Arnold and .Tames Whitcomb Riley. Arnold wielded amp; apos; the brush and pencil on sign-work while living in New Haven, and Riley began life as a sign-painter. From a general consideration of letters and lettering, we pass to the tools of the trade, the pigments, and the construction of the sign-board. Special requirements are treated in separate chapters, as the things necessary to be observed in church lettering, in wall signs, in lettering on oil cloth and canvas, in silk and satin hanner painting, and amp; apos; in smalts and smalting. Work on glassamp; mdash; gilding, pearl leaf enrichment, embossing, and imitation frostingamp; mdash; is given several chapters. Even amp; apos; the prices charged for various kinds of work j are given, the office equipment and stationery amp; bull; are taken under advisement, and side-oecu-pations such as glass-drilling, the manufacture of bronze powder and tinfoil, and t he sil vering of mirrors are dealt with in the concluding chapters of the work. Some Small Houses. By Walter Gray Ross. New York: Frederick Warneamp; amp; Co. 8vo.; 94 pp. Price, amp; dollar; 1 net. amp; ldquo; Some Small Housesamp; apos; amp; apos; was first issued in 19O8. That edition having been exhausted, the opportunity has been taken to enlarge the work. There are ninety reproductions of photographs and black-and-white drawings, besides a frontispiece in color, and many of these cannot fail to interest that great proportion of -educated people who, as the author truly says, have to make their homes in small houses. It is an English publication, hence the cost estimates given will not apply to this country. Aside from this drawback, however, there is no reason why the designs should not be at least helpfully suggestive to American home-builders, if not to be adopted in their entirety. Commercial Geography. By Edward Van Dyke Robinson. Chicago: Rand, McNallyamp; amp; Co. 12mo.; 455 amp; plus; 48 pp. Price, amp; dollar; 1.25 net. The last decade has seen the publication of a number of commercial geographies which all have more or less merit. The present volume, however, departs rather radically from its predecessors, and being published by a large map and atlas house, the maps themselves are of the highest order. It is impossible to see how a more complete and useful book on this subject could possibly be written. The beautifully colored maps are not placed at the end of the volume or scattered through the book as inserts, but are actually printed where they belong with the text. The illustrations are numerous and are in the main well executed. The author has performed his task in a thoroughly scholarly manner, and has produced a book which should be in the library of all persons who are interested in progress, whether they care for a commercial geography or not. The possession of this book will widen the mind of any one. Few people, for instance, could tell you much about the Canal Zone. Here we find a map showing the boundary lines, the position of the great Gatun locks, Panama, Panama Harbor, the Culebra Cut, etc. The treatment is of course regionary. We can recommend this book as being a valu-a ble addition to the library. The New Dictionary of Statistics. a Complement of the Fourth Edition of Mulhallamp; apos; s amp; ldquo; Dictionary of Statistics,amp; rdquo; by Augustus D. Webb, B.S.C., F.F.S. London: George Routledgeamp; amp; Sons, Ltd. New York: E. P. Duttonamp; amp; Co. Quarto; 682 pp. Price, amp; dollar; 7. "Mulhallamp; rdquo; is the great authority which is constantly cited by all statisticians. Unfortunately, however, it is out of date, so that the present volume will be warmly welcomed as a complementary volume. In our own experience we have found that the book on statistics is out of date in certain particulars before the first copy leaves the bindery. amp; ldquo; Figures,amp; rdquo; according to the ofl-quoted dictum, amp; ldquo; csm prove anything.amp; rdquo; As a matter of fact, they prove nothing. It is the human mind that proves (or attempts to prove) things, and things are hut evidences to be examm^ weighed, and judged as any other kind of evidence. To this end no explanatory matter, either in the way of foot notes or of text that may accompany the figures, should be Mt tm-read 0r ignored. This advice from the preface is specially good advice. The author wisely notes that the comparison of internationfd statistics is notoriously difficult. The expense of producing a book of this kind is so grait: that it is to be hoped that it will hare a considerable sale. The book is very weU made. Modern Methods of Water Purification. By John Don, F.I.C., A.M.I., and Jolin Chisholm, A.M.I. New York: Lamp; deg; ng-mans, Greenamp; amp; Co., 1911. 8vo.; 368 pp.; 96 illustrations. Price, amp; dollar; 4.20 net. ThiS iS a review of the different processes of water purification, with a consideration amp; deg; f the extent to which they are justified by rcsiilts. Much of the existing literature of this subject is ill periodical form and to scatamp; gt; tered Health Board reports. amp; ldquo; ModM-n Mrth-ods of Water Purificationamp; rdquo; brings togethCT the gist of these scattered papers and pmstmts it in a readily accessible and permanent: form. The sources of supply are considered in ctamp; gt; n-nection with the means used for the detectmii of pollution. Storage and the chemica 1 changes it effects are dealt with in a succeeding chapter, and the copper sulphate treatment of plant growths is explained. Tim (amp; apos; hapter on the construction of reservoirs is illustrated hy diagrams showing basins to this country and in England. Sand filtraUtm and the management of sand filters is given Space equal to almost a fourth of the entire volume. Mechanical filters, the ozone process, water-softening and household appliances, the testing of water, and the problems of distribution are treated in the latter part of the work, which concludes with filtration constants and data, tables, and a short hibliography. Water purification is a subject of growing interest and great importance. The work in hand is timely and comprehensive. LEGAL NOTICES PATENTS INVENTORS are invited to communicate with Munnamp; amp; Co., 361 Broadway, New York. ur 62; ) F Street, Washington, amp; lowbar; D. C., in regard to securing valid patent protection for tbeir inventions. Trade-Jlarks and Copyrights registered. Design Pat ents and Foreign Patents secured. A Free Opinion as to the probable patentability of an invention will be readily given to any inventor furnishing us with a model or sketch and a brief description of the device in question. All communications are strictly confidential. Our Hand-Book on Patents will be sent free on request. Ours is the Oldest agency for securing patents; it was established over sixLy-five years ago. MUNNamp; amp; CO., amp; ldquo; 361 Broadway, New York Branch Office. 625 F St., Washington, D. C. ATTN T S SECURED OR FEE 1 Ej m 1 J RETURNED PA1 E H amp; ast; RETURNED Free report as to Patentability. Illustrated Guide Book. and Wbat To Invent with List of Inventions Wanted and Prizes offered for inventions sent free. VICTOR J.KVANSamp; amp; CO.. Washington. D.C. Classified Advertisements Advertising in this column is 75 cents a line. No less than tour nor more than 12 lines accepted. Count seven words to the line. AH orders must be accompanied by a remittance. Further information sent on request. HELP WANTED. SUPERINTENDENT.-Metal Department ofa large manufacturing concern. One who thoroughly understands the making and finishing of articles from sheet metals. No one who is not thoroughly experienced need apply. Permanent position to right party. Address Metal Expert, Box 773, N. Y. WANTED. amp; mdash; A Orst - class American automobile machinist. to take charge, and to act asamp; ast; foreman in an up-to-date Garage. Please state experience. Address Youngsamp; amp; Co., Newburg, N. Y. PATENTS FOR SALE. FOR SALE. U. S. Patent No. 997,227. Automobilists tool. Consists of liltingjack, pick. shovel, boe and pinch bar. Nothing of its type or character on tbe market. A sure seller. Will sell outright for amp; dollar; 6.000. Address, F. S. Baud and William Peters, Jackson, Cal. SUCCESSFUL TROUSER STRETCHER amp; mdash; IT. S. patent. Easy to make. Sells to every man. For further particulars address, A. E. Eastlund, 401-402 Maegly Tichner Building, Portland, Oregon. WANTED. LOCAL REPRESENTATIVE WANTED. Splendid income assured right man to act as our representative alter learning our business thorough ly by mail. Former experience unnecessary. All we require is honesty, ability,ainbition and willingness to learn a lucrative business. No soliciting or traveling. This is an exceptional opportunity for a man in your section to get into a big payingbusiness without capital and become independent for life. Write at once for full particulars. Address. E. R. Maroen, Pres. The National Co-Operative Real Estate Company, L 378, Marden Building, Washington, D.C. WANTED. A DDRESSES OF US ERS OF G RA PHITE Slate, Soapstone. Hydro-Mica and Fullers Earth in both crude and manufactured state. For particulars, address Howard and Company , Savannan, Ga. how to judge different classes of inve.. tments the Real Earning Power of your money. This magazine MISCELLANEOUS. FREEamp; mdash; INVESTING FORPROFITamp; rdquo; Magazine. Send me your name and 1 will mail you this magazine absolutely free. Before you invest a dollar anywhereamp; mdash; get this magazine amp; mdash; it is worth amp; dollar; 10 a copy n month. Tells you how amp; dollar; 1,001) can grow to amp; yen; 22.000 class of your six months tree if you write to-day. H. L. Barber, Publisher, 423, 28 W. Jackson Blvd., Cbicayo. BE INDEPENDENT-Siart Money Making Mail Order Business at Home. New Plans. Everything furnished. Only small capital required. Free booklet tells how. S. A. Miller Co. . Box254, Muskegon, Mich. THE ARTIFICIAL RAIN SYSTEM.-New and successful invention of great industrial and agricultural possibilities. Artificial rain combined with electrified water as food for plants. The best and cheapest fertilizer in the world. Indispensable to farmers. agricultu- t r t thissystemofirrigatiom Easilyworked. Frost, drought, insects.effectively combated. Capital required to introduce and work this new system in the United states. Address, Emilio Olsson, 32 West 9th Street, New York. FREE TUITION BY MAIL. Civil Service. Drawing, Engineering, electric wiring, agricultural, poultry, formal, academic, bookkeeping, shorthand courses. iVIatri-culationamp; dollar; 5. Tuition free to first applicant. Apply to Carnegie College, Rogers, Ohio. LISTS OF MANUFACTURERS. COMPLETE LISTS of manufacturers in all lines supplied at short notice at moderate rales. Small and special lists compiled to (,rder at various prices. Esamp; ast; limates should be obtained in advance. Address Munnamp; amp; Co . amp; bull; Inc.. List Department. Box 773. New York. INQUIRY COLUMN READ THIS CO LUMN CAREFULLY.-You will find iuquines tor certain classes of articles numbered in consecutive order. If you manufacture these goods write us at once and we will send you the name and address of the party desiring- tbe information. There is no charge for this service. In every case it is necessary to give the number of t he inquiry. Where mauutacturers do not respond promptly the inquiry may be repeated. M UNN amp; amp; gt; CO.amp; ast; Inc. Inquiry No. 9amp; apos; amp; laquo; S46.amp; mdash; Wanted, addresses of parties having raw materials or minerals containing potash in an Inquiry No. 9247.amp; mdash; Wanted. to buy a Parmelee aerated water. Inquiry No. 9254.amp; mdash; Wanted. the name and address of manufacturers of lead pencils and pen hvlders, such as are used for printing ao vertisements on. Inquiry No. 9amp; apos; 255.amp; mdash; Wanted, to buy a patent rol-ler,a ball-bearing axle.wbich could be purchased ona royalty basis: it must be cheap and fully proved. Inquiry No. 9amp; apos; -amp; pound; amp; gt; amp; gt; tamp; gt; . Wanted addresses ofparties having Pitchblende deposits. if able to ship ore. Inquiry No. 9257. Wanted addresses of firms selling second-hand water turbines. Inquiry No. 925S.amp; mdash; Wanted addresses of parties having gem materials to offer in any part of the world. Inquiry No. !J239.amp; mdash; Wanted to buy amacbine for removing the coating of a filbert. Inquiry No. 9260.amp; mdash; Want addresses of parties able to ship corundum. garnet, flint, emery or any material suitable as an abrasive. The New Era of Blood-transfusion (Continued from page 123.) fastened into that one of the two grooves on the ring which happens to be nearest to the handle. (See Crile method.) The artery is then drawn over the vein so its inner surface touches the cuff, and is fastened into ,the remaining groove. The lining of the two blood-vessels thus meet as in the Carrel suture. Crile experimented upon hundreds of dogs before operating upon a single human being, and has been roundly abused for his pains by the anti-vivisectionists. There being obvious danger to the giver from anaemia, and danger also that the heart of the patient might be filled So full that it could no longer pump, Crile wanted to know just how much blood might be lost and received. The heart requires a certain volume of fluid (blood) in the vessels in order to have enough to pump on. So, in severe hemorrhage, temporary relief is given by filling up the vessels with salt water (saline-solution, infusion, as it is called). The salt water cannot replace the blood, but it gives the heart something with which to pump, and so tides the body over the emergency. After a time, the salt-water leaves the body through the kidneys, and the patient is as badly off as before. This is not the case with transfused blood; that stays in the vessels. There is another condition known as amp; ldquo; shock,amp; rdquo; in which although the blood stays in the vessels, the heart has just as much difficulty to pump as though there had been a bad hemorrhage. The reason is because in shock, the injury to the nervous system causes a paralysis of the nerves known as vasomotor. The result of thisamp; apos; paralysis is that the blood-pressure disappears just as though a severe hemorrhage had removed the amp; apos; blood, and Crile has shown that, also for this condition, transfusion is the best remedy we have. A man may be so injured by machinery as to require an immediate operation, but he has lost so much blood that his remaining strength may give way; transfusion rectifies the condition by supplying a sufficient quantity of red blood-cells to combine with the oxygen of the air and give back the oygen to the tissues. Crile says that recovery from hemorrhage is largely a problem in mechanics, as andrenalin has been added to the circulation even after death, and the heart action substituted by manual pressureamp; mdash; and blood-pressure thus made to rise. We all know when a man is poisoned by gas that the red coloring matter (three hundred times as greedy of carbon-monoxide as of oxygen) has been displaced. Thus the blood is destroyed, and new blood, through transfusion, furnishes a certain corrective, if not delayed too long. Research on the Blood. Denys in the 17th century advocated the use of animal blood in transfusion; maintaining that as the animal lives more closely to a state or nature, his blood must be. purer than manamp; apos; s; and answered arguments against it by inquiring why the meat we eat and the milk we drink does not act deleteriously. In view of modern blood-tests, his attitude is instructive as showing what plausible fallacies may be advanced if reasoning, as such, be not corrected by experience. In 1821, Dumas and Provost gave out tho results of their studies on the chemical properties of the blood; showing that when the bloods of different species were j mixed, even though- the globules were of the same size but of different dimensions, animals rarely lived longer than six days. The blood of an animal with circular corpuscles injected into a bird caused the death of the bird with symptoms of violent poisoning. In 1875, Landois showed precisely what takes place when the blood is thus mixed. The red corpuscles are dissolved by the poisoning of the protoplasm, and the hemoglobin (coloring matter) exuded from the envelope. Under the microscope, the first stage of this condition (hemolysis) shows the corpuscles beginning to swell. The injection of certain chemicals causes the same phenomenon, and hemolysis occurs on artificial heating or freezing of blood. The consequence is the breaking down of the cell-wall. Thla objective demonstration. as might have been expected, put a stop to the use of animal blood in transfusion. Modern transfusion shows that while the blood of one healthy person does not poison the blood of another healthy person, the blood may acquire such power through certain diseases, since the disease may act in such manner as to change it. In this case, too, there is a dissolving of the cells by blood which, though apparently normal, in reality is not. If the sick manamp; apos; s blood has this property of dissolving (hemolyzing) the blood-cells of the giver, the new blood will do him no good, as it will be destroyed as rapidly as it is transfused. If by an oversight the blood of the giver has this property, the transfusion will be even more dangerous, as the new blood will destroy that already present in the patientamp; apos; s vessels. By testing the two bloods against each other this danger may be avoided. Another peculiar property of the blood is what is called agglutination, known only since 1900. When the bloods of two different persons are mixed, they often have the effect of making the blood-cells clump together in tight little masses. Landsteiner showed that all human beings fall into four sharply defined classes in this regard, and that agglutination may be explained by assuming the existence of two agglutinins, of which the second group possesses one, the third group the other, the first group both, and the fourth neither. When the blood of persons belonging to any one class is mixed with the blood of a person belonging to any of the other three classes, ag-glutihation occurs; but this is avoided if the blood-test shows that the giver and receiver of the blood belong to the same class. This is a hereditary quality, and an examination of seventy-two families shows that the agglutinins follow Mendelamp; apos; s law. It is evident that if blood were transfused from a person belonging to one of the classes referred to, into the vessels of a person belonging to any one of the other three classes, the clumps likely to form would cause a stopping up of the blood-vessels, and thus serious trouble indeed. Ottenberg is in vestigating further the phenomenon of agglutination at Columbia College and Mt. Sinai Hospital at the present time. Medical opinion is that performing the agglutination-test for transfusion may, in many cases, make all the difference between a transfusion that is successful and one that means merely a waste of human blood. Formerly, the patient often became worse after the operation; indiscriminately taking blood from anyone willing to give it was a contributing cause. Now when members of the family are rejected, for the reasons outlined, advertisements are put in the newspapers; fifteen to twenty respondents, at that, often being rejected as unfit to serve, and the one selected whose blood has the least , or no toxic action. The person who gives his blood must be strong enough to lose it, and he must have no blood-disease; by which it would appear that even selling oneamp; apos; s blood is not by any means as easy as might be supposed.