Keim, see Germ.
Kirchner, on development of Volvox, [204].
Kölliker, on nature of spermatozoa, [175];
on embryonic cells, [196].
Lagynus, fission of, [148].
Lamarck, on use and disuse, [83], [84], [303], [387], [391], [421].
Lamellibranchiata, length of life of, [55].
Larvae, length of life of, [15].
Lasius flavus, length of life of, [50];
L. niger, [51].