dogs of Paraguay, ii. [87];
feral pigs of Buenos Ayres, i. 77;
on the refusal of wild animals to breed in captivity, ii. [149];
on Dicotyles labiatus, ii. [150];
sterility of plantigrade carnivora in captivity, ii. [152];
on Cavia aperea, ii. [152];
sterility of Cebus azaræ in captivity, ii. [153];
abortions produced by wild animals in captivity, ii. [158].
Reproduction, sexual and asexual, contrasted, ii. [361];
unity of forms of, ii. [383];