vill Contents 
CHAPTER VI 
EXPERIMENTAL HYBRIDIZING. ‘ z 4 3 : 
Mendel’s Law P P ‘ ‘i 3 
Mendel’s Law and the eee Fi . ’ 7 
CHAPTER VII 
EXPERIMENTAL HYBRIDIZING (Condinued) 
Experiments with Mice 
CHAPTER VIII 
EXPERIMENTS WITH OTHER MAMMALS AND WITH BIRDS . 
Experiments with Guinea Pigs. é . : . 
Experiments with Rabbits 
Experiments with Rats 
Experiments with Cats . 
Data for Other Maminals and Man 
Experiments with Poultry 
Experiments with Pigeons 
CHAPTER IX 
EXPERIMENTS WITH SNAILS, MOTHS, AND BEETLES . i 
Experiments with Silkworms 
Experiments with Beetles fi 
Experiments with the Currant Moth 
Experiments with Tephrosia 
CHAPTER X 
OTHER KINDS OF HYBRIDIZING : . . : . 
Blended Inheritance . . F ‘ , . 
Mosaic Inheritance i 2 . . . 
Hybridization between Time Sadie . . 
Dimorphism P 
Reversal of Symmetry . 5 
Conclusions regarding Mendelian Diente . . 
CHAPTER XI 
BEHAVIOR OF THE GERM-CELLS IN CROSS-FERTILIZATION . 
Experiments with Amphibia 
Experiments with Echinoderms 
Factors involved in the Entrance of the Ssconaianion 
Artificial Helps to Fertilization and to Cross-fertilization 
Polyspermy . . . 
