In the Medical Record of January 17, 1885, is found the first report of the application of the Pneumatic Cabinet to diseased conditions of the lungs. This process was called Pneumatic Differentiation and the description was entirely confined to what in the perfected instrument shown to day is the first act, i. e., producing rarefaction in the cabinet about the patient and compelling him to respire the normal atmosphere. That report contains the history of sixty-two cases treated in this manner, seven of which were given in detail, and five there classed as recovered further appear in my second paper delivered before the American Climatological Association, and published in the New York Medical Journal, October 3, 1885. Further reference to these cases will be made in a clinical report which I shall have the honor to present to the same Association during the present month. It will show these cases
WILLIAMS HF. THE PROGRESS OF PNEUMATIC DIFFERENTIATION. JAMA. 1886;VII(7):169–172. doi:10.1001/jama.1886.04250080029001
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