CONTENTS 
CHAPTER I 
INTRODUCTION 
Subject-matter—The study of evolution—Dependence 
on other sciences—The problem of the nature and 
origin of species—Linnzan species—Jordan’s species 
—tThe discontinuity of species—Methods of study— 
Variation—Different theories as to the origin of 
species: Lamarck’s theory; Darwin’s theory; the 
sree theory—Recent study of species Biometry ; 
Mendelism - - I 
PAGE 
CHAPTER'II 
EVOLUTION 
Definition—Evolution of matter—Evolution in geology 
—The age of the earth—Organic evolution—Evi- 
dences of organic evolution—The__ theory _ of 
Lamarck. - = 7 : - - 22 
4 CHAPTER IL 
THE THEORY OF NATURAL SELECTION 
Historical—Darwin’s attitude to variation—Artificial 
selection—Malthus and the geometrical rate of 
increase of living things—Natural selection—Adapta- 
tion—Protective resemblance and mimicry—Parallel 
evolution — Regeneration — Sexual selection — The 
inheritance of acquired characters—Herbert Spencer’s 
arguments—Weismann and the purity of the germ 
cells - - - - - 7 42 
sa 
