Excerpt from Dehydrothiotoluidin; Its Isomers, Homologues, Analogues, and Derivatives: Dissertation, Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in the Faculty of Pure, Science of Columbia University Historical Review of Previous Work Although the volume of.research which has been accomplished in this field is quite large, and the compounds important, mosttextbooks omit.it entirely or dismiss it with a few lines, and even the original papers do not give much information about other work. No really acceptable summary of all of the work has ever been published, and, as it would be very useful to new investigations in the group, it is this which has led to the rather complete form in which the history is presented. Furthermore, the second and third Objects of this investigation make a knowl edge of what compounds have been prepared, and of their proper ties essential, and these are given at the end. 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.