SICHEL, J., on the deafness of white cats with blue eyes.
SIDNEY, S., on the pedigrees of pigs. -on cross-reversion in pigs. -period of gestation in the pig. -production of breeds of pigs by intercrossing. -fertility of the pig. -effects of interbreeding on pigs. -on the colours of pigs.
SIEBOLD, on the sweet potato.
SIEBOLD, CARL VON, on parthenogenesis.
Silene, contabescence in.
SILK FOWLS.
SILK-MOTH, Arrindy.
-Tarroo.
SILK-MOTHS. -domesticated, species of. -history of. -causes of modification in. -differences presented by. -crossing of. -disease in. -effects of disuse of parts in. -selection practised with. -variation of. -parthenogenesis in.
SILKWORMS, variations of. -yielding white cocoons, less liable to disease.
SILVER-GREY rabbit.