. American X-ray journal . Sawyer, , Physician Au-burn Prison, Auburn, N. Y. Carlos MacDonald. M. D., Pleasant-ville, N. Y. P. J. Gibuons. M. A., M. D , Syra-cuse, N. Y. S. B. Granger. M. D., Ed. N. Y .Medical Jour., New York. Cincinnati Enquirer and CommercialTribune. Cincinnati. O. Urlin & Pfeiffer, Photographers, Col-umbus. Ohio. Weight of a Hydrogen Molecule.—The weight of a molecule of hydrogen, asgiven by an eminent authority, is ap-proximately o. 000,000,000,000,000,000-000,04 gram: by multiplying this incon-ceivably small number by 55, the atomicweight of iron, we get the weight of
. American X-ray journal . Sawyer, , Physician Au-burn Prison, Auburn, N. Y. Carlos MacDonald. M. D., Pleasant-ville, N. Y. P. J. Gibuons. M. A., M. D , Syra-cuse, N. Y. S. B. Granger. M. D., Ed. N. Y .Medical Jour., New York. Cincinnati Enquirer and CommercialTribune. Cincinnati. O. Urlin & Pfeiffer, Photographers, Col-umbus. Ohio. Weight of a Hydrogen Molecule.—The weight of a molecule of hydrogen, asgiven by an eminent authority, is ap-proximately o. 000,000,000,000,000,000-000,04 gram: by multiplying this incon-ceivably small number by 55, the atomicweight of iron, we get the weight of amolecule of iron—,000,000,000,- 000,000,002,20 gram. In the sulphocyanide test we are enabled to detect thepresence of thirty-three ten-millionths ofa gram of iron; dividing this number bythe weight of one molecule of iron, wefind that this apparently delicate test isunable to indicate a less number of mole-cules than 1,500,000,000,000,000. Radiograph, by Dr. William Mair,Calcutta, India, showing point of a. needle imbedded in fifth metacarpalbone, where it had been lost for seven-teen years. THE AMERICAN X-RAY JOURNAL. 4 9 \ OR ROENTGEN RAY RESULTS I INAMAUROSIS. FREDERICK STRANGE KOLLE, M. D. The statement that the Roentgen rayswere to a certain extent valuable in thsirpower to enable the blind to see, hascaused considerable excitement and in-terest, and has made the blind patientlook forward to the renewal of his sightwith hope and longing. These poor, unduly misled individualsarrive at our offices and demand treat-ment with the x-rays, feeling assuredthat they may be made to see at once,or in due time be able to move aboutwithout the aid of an attendant—per-haps to even write or read. That thisfeeling has been aroused in these unfor-tunate individuals is not to be wonderedat, and the question arises, what can bedone with this class of patients ? When I first read or heard of the factthat the blind were able to distinguishshadows and light, when brought near aCr
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