loss of jaws in development of, [89];

winter eggs of, [121];

sperm cells of, [175], [176];

parthenogenesis of, [228], [325];

summer eggs of, [236], [239], [240];

polar bodies in parthenogenetic eggs of, [249], [345], [350].

Darwin, on constancy of number of individuals in successive generations, [12];

on Pangenesis, [77], [370];

on atrophy of organs, [85], [90];

on cross fertilization, [309];