on crossing sheep, ii. [120];
on selection of sheep, ii. [195];
diminished fertility of Merino sheep brought from Spain, ii. [161].
Sooty fowls, i. 230, 256.
Soto, Ferdinand de, on the cultivation of native plants in Florida, i. 312.
Sorghum, i. 371.
Spain, hawthorn monogynous in, i. 364.
Spallanzani, on feral rabbits in Lipari, i. 113;
experiments on salamanders, ii. [15], [293], [385];
experiments in feeding a pigeon with meat, ii. [304].