Ducksworth, 184.
Eagle, 44.
Earthquake, 85.
Echidna, bottom of mammalian scale, 43.
Ectoderm, 255.
Egg, of common fowl, 60;
of frog, 68;
nuclei contains factors of development, 71; 144, 145;
human, 231.
Eimer, 148.
Elements, chemical, 15.
Elephant, 41;
place in zoölogical science, 95; 96, 97;
age of, 124.
Embryo, of frog, 58;
of chick, 60-62, 63, 64, 65;
embryos of carnivora, rodents, hoofed animals alike in earlier
development, 65;
of cat, dog, rat, sheep, rabbit, squirrel, cattle, pig, 65;
of skate, shark, hammerhead, 66;
the human, 168, 170, 171;
of birds, reptiles, amphibia, 171;
human hemispheres of brain like adult cat or dog, 215.