affinity of the tissues for special organic substances, ii. [380].
Pallas, on the influence of domestication upon the sterility of intercrossed species, i. 31, 83, 193, ii. [109];
hypothesis that variability is wholly due to crossing, i. 188, 374, ii. [250], [264];
on the origin of the dog, i. 16;
variation in dogs, i. 33;
crossing of dog and jackal, i. 25;
origin of domestic cats, i. 43;
origin of Angora cat, i. 45;
on wild horses, i. 52, 60;
on Persian sheep, i. 94;