Strix grallaria, ii. [302].
Strix passerina, ii. [154].
"Strupp-Taube," i. 155.
Struthers, Mr., osteology of the feet in solid-hoofed pigs, i. 75;
on polydactylism, ii. [13]-[14].
Sturm, prepotency of transmission of characters in sheep and cattle, ii. [66];
absorption of the minority in crossed races, ii. [88];
correlation of twisted horns and curled wool in sheep, ii. [326].
Sub-species, wild, of Columba livia and other pigeons, i. 204.
Succession, geological, of organisms, i. 11.