CONTENTS 



PART I 



THE PROBLEM OF GENESIS 



CHAPTER I 



PSYCHOPHYSICAL EVOLUTION 



PAGE 



I. Scope and Method I 



2. The Psychological and the Biological ...... 4 



3. Psychophysical Parallelism ........ IO 



4. Psychophysical Parallelism in Evolution 13 



CHAPTER II 



COMPARATIVE CONCEPTIONS 



i. Recapitulation . ......... 20 



2. Natural and Functional Selection; Plasticity and Intelligence . 21 



3. Correlation of Characters ........ 24 



4. Psychophysical Variations 26 



CHAPTER III 



THE DIRECTION OF EVOLUTION 



i. Genetic Determination : Congenital and Acquired Characters . 34 



2. Genetic Determination : Factors ....... 37 



3. Intergenetic Concurrence 41 



4. Genetic Analogies . 43 



5. Preformism and Accommodation ....... 45 



xi 



