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Excerpt from An Introductory Lecture: Delivered in the Laboratory of Yale College, October, 1828 The substance of the following pages has been, more than once, communicated to my pupils, at the beginning of my annual courses of lectures. Some of the students having requested leave to take cop ies, which it was not then convenient to permit, I have now revised and printed the remarks. 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.