Bulimus, length of life of, [55].
Buprestis splendens, length of life of, [47].
Burdach, on the influence of maternal impressions on the offspring, [444].
Bütschli, on polar bodies, [188], [214], [224], [340];
on sexual reproduction, [282];
on processes of fertilization, [355].
Butterflies, climatic varieties of, [99];
death of, [120].
Bythotrephes, spermatozoa of, [176];
summer eggs of, [239];