Excerpt from An Introductory Lecture, Preliminary to a Course on the Institutes of Medicine: Delivered on the 9th of October, 1850, Before the Medical Class of the University of Pennsylvania The atmosphere is vitiated and contaminated in various ways. Respi ration is the most common. Accurate observations have established that from 4 to 5 per cent. Of carbonic acid is contained in the air expired by a. Male adult, and a somewhat larger per centage of oxygen has disappeared. The amount of air passing through the lungs in 124 hours, is about 400 cubic feet, which loses about 20 cubic feet of oxygen, and receives about 16 cubic feet of carbonic acid. The same air breathed three or four times becomes poisonous. One per cent. Of carbonic acid in the air, if breathed for some time, is prejudicial and death has been caused by a vitiation of not more than 12 or 15 per cent. These facts show the importance of free ventilation to the preservation of health, and the free exercise of the functions, mental and physical. 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.

Excerpt from Introductory Lecture to the Course on the Institutes of Medicine: Delivered in the University of Pennsylvania, October 16th, 1859 The great difficulty of medical art and science arises from the number, diversity, and obscurity of its pheno mena. A very slight observation will demonstrate that the phenomena of living beings are very dissimilar, that though each is acting independently yet all occur to a common end. A further observation demonstrates that a large proportion of the phenomena of living organisms are identical with those of the collateral sciences, have a similar origin and are amenable to the same laws. In constructing animal organisms nature has not provided a single organic and vital material for all the tissues and organs, or a single organic form or principle, but has drawn largely on other and exterior aids for her materials, and borrowed, if the term may be used, the forces and phenomena of the exterior world, which our finite intelligence compels us to separate into distinct sciences, though no such distinction exists in nature. 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.

Excerpt from Lecture, Introductory to a Course on the Institutes of Medicine, in the University of Pennsylvania, Delivered October 20th, 1847 The concurrence of physical power is equally shown in all the great functions: they are dependent on it for their performance. Respiration, voice, digestion, the introduction of the ingesta and expulsion of the egesta, are all accomplished by physical power. 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.