Produced by Juliet Sutherland, Janet Blenkinship and the Online Distributed Proofreading Team at https://www.pgdp.net THE STORY OF THE LIVING MACHINE A REVIEW OF THE CONCLUSIONS OF MODERN BIOLOGY IN REGARD TO THE MECHANISM WHICH CONTROLS THE PHENOMENA OF LIVING ACTIVITY BY H.W. CONN PROFESSOR OF BIOLOGY IN WESLEYAN UNIVERSITY AUTHOR OF THE STORY OF GERM LIFE, EVOLUTION OF TO-DAY, THE LIVING WORLD, ETC. _WITH FIFTY ILLUSTRATIONS_ NEW YORK D. APPLETON AND COMPANY 1903 COPYRIGHT, 1899, By D. APPLETON AND COMPANY. PREFACE. That the living body is a machine is a statement that is frequently made without any very accurate idea as to what it means. On the one hand it is made with a belief that a strict comparison can be made between the body and an ordinary, artificial machine, and that living beings are thus reduced to simple mechanisms; on the other hand it is made loosely, without any special thought as to its significance, and certainly with no conception that it reduces life to a mechanism. The conclusion that the living body is a machine, involving as it does a mechanical conception of life, is one of most extreme philosophical importance, and no one interested in the philosophical conception of nature can fail to have an interest in this problem of the strict accuracy of the statement that the body is a machine. Doubtless the complete story of the living machine can not yet be told; but the studies of the last fifty years have brought us so far along the road toward its completion that a review of the progress made and a glance at the yet unexplored realms and unanswered questions will be profitable. For this purpose this work is designed, with the hope that it may give a clear idea of the trend of recent biological science and of the advances made toward the solution of the problem of life. MIDDLETOWN, CONN., U.S.A. _October 1, 1898_. CONTENTS. PAGE INTRODUCTION--Biology a new science--Historical biology--Conservation of energy--Evolution--Cytology--New aspects of biology--The mechanical nature of living organisms--Significance of the new biological problems--Outline of the subject 1 PART I. _THE RUNNING OF THE LIVING MACHINE._ CHAPTER I. IS THE BODY A MACHINE? What is a machine?--A general comparison of a body and a machine--Details of the action of the machine--Physical explanation of the chief vital functions--The living body is a machine--The living machine constructive as well as destructive--The vital factor 19 CHAPTER II. THE CELL AND PROTOPLASM.