Excerpt from The Chicago Medical Journal and Examiner, Vol. 43: July to December, 1881 The opinion was long entertained vaguely by many physicians that small-pox and vaccinia were entirely distinct, though similar, diseases. This belief was based upon the fact that Jenner did not himself fully comprehend the manner in which these two forms were related. He believed that they were identical in their origin, but he did not demonstrate that identity. It was his Opinion that horse-pox infected the cow through the interven tion of the hands of the stable-boy who attended both animals, but he did not establish the origin of the horse-pox. It was only when the experiment of variolating the cow with the virus of small-pox had been successfully performed that the fundamental identity of variola and vaccinia was demonstrated. This was first performed, in 1801, by Gasser, of Giinsberg (seaton, Reynolds' System of Medicine, Vol. I., p. 176, Am. Ed.) Inoculating eleven cows with small-pox virus he produced on one of them vesicles hearing all the character of vaccine vesicles, and from them a stock of genuine vaccine lymph was obtained. The same experiment (zoc. Cit.) was performed, in 1802, at the Veterinary College at Berlin. Mr. Ceely, of Aylesbury, in England, was equally successful in 1839. In 1840 (100. Cit.) Mr. Badcock, of Brighton, succeeded in procuring genuine vaccine virus by vario lation of the cow; and he met with equal success on thirty seven subsequent occasions. It has also been shown that cattle can be variolated by inocu lation of the volatile exhalations of variolous clothing, etc., but this is of rare occurrence. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.