early domestication and probable origin of the, i. 43-44;
intercrossing of with wild species, i. 44-45;
variations of, i. 45-48;
feral, i. 47, ii. [33];
anomalous, i. 48;
polydactylism in, ii. [14];
black, indications of stripes in young, ii. [55];
tortoiseshell, ii. [73];
effects of crossing in, ii. [86];
fertility of, ii. [111];