"Social Environment and Moral Progress," Wallace's, ii. [104], [144]-5, [250]
"—— Statics," Spencer's, i. 123, 150, ii. [143]
Socialism, Wallace's first lessons in, and later views of, i. 15, 16,
ii. [139] et seq.;
"individualistic," [114];
Wallace's definition of, [152]
Society for Psychical Research, foundation of, ii. [196]
"Sociology, Principles of," i. 126
"—— Study of," Spencer's, i. 283
Solar nebula, lecture by Sir R. Ball on, ii. [174]
—— system, central position of, ii. [171]
South America, fauna of, ii. [10]