A SPRIGHTLY young paper published at Trenton, N. j. called the Young Men's Monthly, is devoting considerable space to the exposure of " Swindling in New York." Mayor Hall has also given a note of warning through the press against the numerous vampires who prey upon the credulity of the innocent and unsuspecting, but all labor bestowed in that direction will be temporary until people learn that the only safe course for them to pursue is to transact their business with reputable business firms. Gift enterprises are generally swindles; a great majority of advertised patent medicines are positively injuiiousto those who take them, and the public should beware of all advertisements that offer to send something for almost nothing. Such " catch-traps " are so numerous that we cannot undertake to name them; but of one thing our readers may rest assured—viz., that what cannot be purchased either of or through a respectable tradesman, is ordinarily not worth looking after. Dr. Brown-Sequard, reports a curious case of a dog which had just died, having fresh blood passed into the carotid. The dead animal was revived, stood on his feet, wagged his tail, and lived over twelve hours, when he died again. The above item is going the rounds of the newspapers. The error about the matter consists in the statement that the dog was actually dead. We undertake to say that the dog was but apparently dead. The simple introduction of fresh blood into the carotid of any dead animal would have no effect whatever.—We make this assertion on the authority of the New York Medical Journal, which announces in its last issue the death of a child under peculiar circumstances, adding sapiently to the statement that it was dead, it could not be resucitated. THE English Mechanic in a recent issue discusses the defects in the British Patent System, and calls loudly for reform It wants a cheaper system, one that will make patents more valuable, and less assailable by those who, lacking genius, cultivate cunning and roguery.—It appears that there is now a surplus patent fund amounting to the sum of $2,000,000, out of which it is suggested that an industrial and inventor's museum should be established and endowed,and that the present patent fee should be reduced one-half. The gross injustice of charging such exorbitant fees is fully shown by the enormous surplus which has been accumulated under the present system. We therefore hope that the suggestions of our cotemporary may prevail. THE work of clearing the obstructions at Hell Gate have come to an end for the present. Out of the general appropriation of $1,500,000 made by Congress for river and harbor improvements, the paltry sum of $80,000 only was allowed by the Secretary of War for this important work. We understand that Mr. Shelbourne, who was employed to blast out " Frying Pan" rock, has expended $20,000 out of his own pocket in preliminary experiments and preparations. This work is one of. great national importance and ought to be vigorously pushed forward. PROFESSOR POWELL, who departed nearly one year ago in charge of the scientific expedition to explore the Rocky Mountains, has returned to Bloomington, Illinois, for the purpose of procuring four portable boats in Chicago, which are to be carried out on the Pacific railroad as far as possible. The party are to embark in these boats at the headwaters of Green river, and follow that and other streams into which it empties to the Pacific Ocean. The party will spend some ten months. Mrs. Powell has returned to Bloomington, and will not accompany the second expedition. PROTECTING BIRDS.—The Legislature of Wisconsin, at its last session, passed a law making it a penal offense to destroy or kill, by any device whatever, brown-thrushes, blue-birds, martins, swallows, wrens, cat-birds, meadow-larks, or any other insect-eating birds, anywhere wthin two miles of any incorporated city or village in that State. The Legislature of Pennsylvania also passed an act, afterward approved by the Governor, which imposes a penalty of twenty-five dollars for the killing of any insectivorous bird, one-half of this fine to be paid to the informer. THE appropriation for the survey of the lakes this season is $100,000—much below the amount appropriated for 1868. The organization of the surveying parties has not yet been completed. It is proposed to finish the survey of Lake Superior. In addition to the other work, it is intended to continue the operation of gaging the rivers connecting the lakes, with reference to the supply and outflow of water. The problem is one of very great general interest. THE return of Dr. Livingstone, the veteran English traveler, was expected about four month gince, but up to the present moment his movements are wrapped in mystery. At last accounts, December 14, 1867, he was proceeding along the eastern shores of lake Tanganyika, but no idea can be formed respecting his subsequent course* His fate is regarded with, some degree of uncertainty. ENGLISH coach builders are beginning1 to announce that they are pie-pared to build light carriages on wheels imported from America, They have discovered at last that the Americans are half a century ahead of them in the matter of car riage building1, HONOB TO AN AMERICAN CITIZEN.—A telegram from Paris, May 4th, announces that the Geographical Society oi France have decreed a gold medal to Dr. Hayes, of the United States, for his eminent services in the work of Arctic exploration and discovery. That day the president of the society, with a deputation of members, waited upon General Dix, the American Minister, and presented the medal, requesting hiir to transmit it to his distinguished countryman, and accompa nied the presentation with an earnest aspiration for continued friendship between France and America. General Dix, in re ply, thanked the president for his friendly expressions in re gard to his country, and said it was a true pleasure for Americans to see France and the United States working together in traditional friendship for the promotion of discovery, science and general progress. CHIMNEY SWEEPING EXTRAORDINARY.—The Amsterdam Soot Company, is the name of an association of chimney sweeps in Amsterdam, Holland. The director has the title oJ *' Royal Chimney Engineer." The managing agent is a distinguished advocate. The company have also a set of com missioners designated by the government, comprising an in spector of public works, a great diamond merchant, already president of one industrial association, and an architectural engineer, who is also a manufacturer. The company has foi it 3 business the sweeping of chimneys and trade in soot. SCIENTIFIC EDUCATION.—The Lafayette College, Easton Pa., has established a scientific department, A. Pardee, of Ha zelton, Pa., having generously placed the sum of $200,000 ir the hands of the trustees for that purpose. The departmeni embraces a thorough technical course of study, with an able corps of professors. We are pleased to notice that a numbei of scholarships have been placed at the disposal of the faculty for the benefit of young men of talent and good moral character. Application for these scholarships should be made tc the President, W. C. Cattell, D. D. THE manufactures of Baltimore are growing. The Sun o1 that city says : " In different quarters new establishments are appearing, and the indications are of a steady advancement of Baltimore as a manufacturing city. Baltimore has long been celebrated for the building of locomotives and marine engines, for her machine shops, rolling mills, agricultural implement establishments, and other branches of mechanical production, but there are other manufactures of more recent growth and of considerable importance." WITH microscope and blowpipe, Mr. Sorby is developing a new method for the examination of minerals. He fuses a small portions (a bead) of the substance to be examined in borax, adds various re-agents according to circumstances, keeps the bead at a dull red heat for a short time, when crystals appear characteristic of the substance, and in some instances singularly beautiful in form. The whole process can be seen and the crystals identified under the microscope. THERE is no other spoken language so cheap and expressive by telegraph as the English. So the electric wires are becoming teachers of our mother tongue in foreign countries. The same amount of information can be transmitted in fewer English words than French, German, Italian, or any other European language. In Germany and Holland especially, it is coming to be a common thing to see telegrams in English, to save expense and ensure precision. PROFESSOR NICKELS, of the Faculty of Sciences of Nancy, in France, recently met his death in a very peculiar manner —by accidentally inhaling the vapor of concentrated hydrofluoric acid, while engaged in making experiments to isolate fluorine. Professor Nickles was the author of many valuable published scientific works.