CONTENTS. 



Introduction Pages 1—4 



PART I. 

 THE DESCENT OR ORIGIN OF MAN. 



CHAPTER I. 



THE EVIDENCE OP THE DESCENT OP MAN FROM SOME 

 LOWER FORM. 



Nature of the evidence bearing on the origin of man — Homologous 

 structures in man and the lower animals — Miscellaneous points 

 of correspondence — Development — Rudimentary structures, mus- 

 cles, sense-organs, hair, bones, reproductive organs, &c.— The 

 bearing of these three great classes of facts on the origin of man 



CHAPTER II. 



ON THE MANNER OP DEVELOPMENT OP MAN PROM 

 SOME LOWER FORM. 



Variability of body and mind in man — Inheritance— Causes of 

 variability — Laws of variation the same in man as in the lower 

 animals— Direct action of the conditions of life— Effects of the in- 

 creased use and disuse of parts — Arrested development— Rever- 

 sion — Correlated variation — Rate of increase— Checks to increase 

 — Natural selection — Man the most dominant animal in the world 

 — Importajice of his corporeal structure — The causes which have 

 led to his becoming erect— Consequent changes of structure — De- 

 crease in size of the canine teeth — Increased size and altered 

 shape of the skull — Nakedness — Absence of a, tall— Defenseless 



condition of man 25 



vii 



