production of breeds of pigs by intercrossing, i. 78, 95;
fertility of the pig, ii. [112];
effects of interbreeding on pigs, ii. [121]-[122];
on the colours of pigs, ii. [210], [229].
Siebold, on the sweet potato, ii. [309].
Siebold, von Carl, on parthenogenesis, ii. [364].
Silene, contabescence in, ii. [166].
Silk-fowls, i. 230, ii. [67], [69].
Silk-moth, Arrindy, ii. [306], [312];
Tarroo, ii. [157].