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Poor's Manual of Railroads of the United States. Thirty-fourth nual Number, 1901. New York: H. V. & H. W. Poor. 1901. 8vo. Pp. 1900. Plates, Maps. Price $10. Poors Manual is a standard handbook and official organ vf the railroad systems of the country, and of every interest connected therewith, containing detailed statements of operations and conditions of every railroad company in the United States and Canada, and the leading railroads in Mexico. Every statement is officially revised before publication. The most important feature introduced into the Manual in recent years is one presented in the edition for 11100, and is entitled Heady Reference Bond List. 1oors Manual is by far the best publication of its kind and its reliability and thoroughness make it absolutely indispensable to every railroad and financial man. STUDIES IN HETEROGENESIS. By H. Charlton Bastian, M.A., M.D., F.R.S. First Part. London: Williams & Nor-gate. 1901. 8vo. Pp. 61. Plates. Price $3. The author Is a well-known medical man who has written a number of books upon the brain and paralysis. He uses the term heterogenesis in the sense originally employed by Burdach, as a class name for processes by which living things arise from the matter of pre-existing organisms belonging to a totally different species--the correlative term homogenesis being used by them as at present, for .the process by which individuals arise in the ordinary way from pre-existing living things similar to themselves in organism. Briefly, however, he defines the term heterogenesis as the production from the substance of organisms 01 their germs of alien forms of life. The author deals with one of the most difficult subjects in the scientific world and the net result of his contribution to the literature of science is sure to be appreciated. CENTRIFUGAL PUMPS, TURBINES AND WATER MOTORS. INCLUDING THE THEORY AND PRACTICE OF HYDRAULICS. By Charles H. Innes, M.A. Manchester: Technical Publishing Company, Ltd. 1901. 12mo. Pp. 226. Price $1.80. The author has put in as concise form as possible the theory of turbines, centrifugal pumps and fans. In one of the chapters will be found a description of steam turbines, [ for which he is indebted to the Hon. C. A. , Parsons, and it is one of the most important discussions of the subject which we have ever seen. In the preparation of the book no effort p has been spared to make the text as clear as possible, and the illustrations are numerous. I How T0 REMEMBER WITHOUT MEMORY SYSTEMS OR WITH THEM. By Eustace - H. Miles, M.A. London: Frederick . Warne & Co. 1901. 12mo. Pp. 278. Price $1. This book is practical vather than technical. It does not contain long discussions as to what our memory is or what it is not, but e gives in concise form pieces of advice as to J how we may best remember. Che principles are based on methods which most of us do _ already frequently use with excellent results. Each person is left free to choose his or her 1. own way, system 01 systems, but it should be tried fairly before condemning. Yet, lest any should say that it is a waste of time to learn systems at all, the author has tried to show the value of a good memory, and the good ef-J fects of ways and systems if properly used on the character, and on success in various branches of life. COMMERCIAL TRUSTS. Growth and Rights of Aggregated Capital. By John R. Dos Passos. New York: G. P. Putnam Sons. 1901. 12mo. Pp. 137. The present work is an argument delivered before the Industrial Commission at Washington, D. C., December 1:, l8D9, corrected and revised. The author deals with aggregations of capital, commercial corporations, over-capitalization, regulation of capital, legal control, anti-trust laws, regulation of trusts, legislation and other allied subjects. SUBJECT LIST OF WORKS ON CE:TAIN CHEMICAL INDUSTRIES IN THE LU.HARY OF e THE (BRITISH) PATENT OFIICE. Lon-s. don: The Patent Office. 1901. T 16mo. Pp. 100. Price 20 cents. We have commented favorably upon the ex- Scellent series of publications which the British Patent Omce is issuing from time to time. They are highly useful, and the present volume is one of the best of the series. It includes destructive diRtillation, mineral oils and waxes, gas li.ghting, acetylene, oils, fats, soaps, candles, perfumery, paints, varnishes, colors, resins, paper and leather industries. ELECTROMAGNETS FOR DESIGN AND CON-slRUCTiON. By A. N. Mansfield, S.B. f New York: D. Van Nostrand Com. pany. 1901. 16mo. Pp. 155. Price f 50 cents. An excellent little book of pocket size in the Van Nostrand Sdetice Series, of which 1 12 vohimes have now appeared. The author treats the suhject mathematically. and the for-re mulas and data which are essential to the design and construction of electro-magnets for . various purposes are here presented In convenient form.
