Birds' nests, i. 134, 191, 212, 213, 252
"—— —— and Plumage," Wallace's, i. 191
"—— —— Philosophy of," Wallace's, i. 212, ii. [6], [8]
Blackbird, crested, i. 163
Blainville, D., i. 162
Blandford, H.F., i. 290
Blood relationship, Galton on, i. 277
Blyth, E., i. 132
Blytt, Axel, essay on plants of Scandinavia, i. 293
Borneo, Wallace's collections from, i. 61;
cave exploration, 152