Excerpt from The Pathologic Changes Caused by Certain So-Called Toxalbumins: An Experimental Study Having in mind the production of immunity from this substance, I have experimented on rabbits with dog serum, but so far without success. On the contrary, I found that animals that had withstood one dose of dog's serum would succumb to a second dose, given after the lapse of some days, or weeks, even when this dose was sub-lethal for a control-animal. 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.