E EAGLE, recognition of individuals by, 76. EAR, Dyticus, 30; corydalis, 30; grasshopper's, 31; Tabanus, 34. EARWIG, method of incubation practised by, 105; care of young by, 105; M. Geer's experiment with, 105; love of offspring in, 106; author's experiments in testing parental affection in the, 136. ECITON HAMATA, ants of the same species rescue an imprisoned, 100; Belt's experiments in testing the sympathy of, 101. ELEPHANT, abstract ideation in the, 217; Conklin's testimony as to abstract ideation in, 218; mud used to stop bullet holes by, 220; a branch of a bush used as a fan by, 221. EPIPONE SPINIPES, method of supplying larva with fresh food used by, 104; differentiation in the amount of food for male and female grub, 104. ETIOLATION, definition of, 184, 185. EUPLOCINÆ, length of life in tropical, 137. EYE, flounder's, 9; plaice's, 9; sole's, 9; mole's, 10; fresh-water _Cymothoe's_, 13; OEquorea's, 15; sea-urchin's, 16; oyster's, 17; _Alciope's_, 17; snail's, 19; crayfish's, 21; _Gyrinus'_, 23; _Periophthalmus'_, 25; _Onchidium's_, 26; calotis', 27.