41-52

2. Mendel's Second Discovery--Independent
Assortment 52-59

3. The Characters of Wild Animals and Plants
Follow the Same Laws of Inheritance as do
the Characters of Domesticated Animals and
Plants 59-84
a. Sexual Dimorphism 61-64
Eosin eye color of Drosophila 61-62
Color of the Clover Butterfly, Colias
philodice 62-63
Color of Papilio turnus 63
Color pattern of Papilio polytes 63-64
b. Duplication of parts 65-66
Thorax of Drosophila 65
Legs of Drosophila 65-66
c. Loss of characters 66-68
"Eyeless" of Drosophila 66-67
Vestigial wings of Drosophila 67
Bar eye of Drosophila 67-68
d. Small changes of characters 68-70
"Speck" 68
Bristles of "club" 70
e. Manifold effects of same factor 71
f. Constant but trivial effects may be the
product of factors having other vital
aspect 73
g. Sex-linked inheritance 75-80
in Drosophila ampelophila 75-76
in the wild species D. repleta 76
in man 77
in domesticated Fowls 77-78
in the wild moth, Abraxas 78-80
h. Multiple allelomorphs 81-84
in the wild Grouse Locust 81-83
in domesticated mice and rabbits 83
in Drosophila ampelophila 84

4. MUTATION AND EVOLUTION 84-88

CHAPTER III
THE FACTORIAL THEORY OF HEREDITY
AND THE COMPOSITION OF THE GERM PLASM

1. THE CELLULAR BASIS OF ORGANIC EVOLUTION
AND HEREDITY 89-98

2. THE MECHANISM OF MENDELIAN HEREDITY
DISCOVERED IN THE BEHAVIOR OF THE
CHROMOSOMES