"Ice-Marks in North Wales," Wallace's, i. 177
"Illustrations of British Insects," i. 23 (note)
"Immigration of Norwegian Flora," Blytt's, i. 293
Immortality, Wallace's views on, ii. [176]
Indian Mutiny, i. 68
Indians, American, Bates's opinion of, ii. [29]
Individual adaptability and natural selection, ii. [55]
"Insectivorous Plants," Darwin's, i. 284, 285, ii. [2]
Insects, migration of, Lyell on, ii. [19];
theory of flight, [26]
Instinct, Archdall Reid's views of, ii. [67]