Excerpt from Orrhotherapy in Diphtheria: Read Before the Illinois State Medical Society, May, 1896Until recently the 'serum prepared by Aronson, Behring and the New York Health Department was of strength known as from 60 to 150 antitoxin units to the cubic centimeter, the different preparations being numbered 1, 2 and 3. Stronger preparations are now made, No. 4 representing 200 antitoxin units, No. 5, 300 units, and No. 0, 400 units to the cubic centimeter. These are obtained, not by concentration of weaker solutions, but directly from the animal that has been inoculated. The stronger preparations are considered quite as safe and are preferable on account of their smaller' bulk which obviates to a considerable degree the pain caused by the large injections.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.