on parthenogenesis, [237];
on direction of growth of pollen-tube, [247];
on heredity, [354], [369], [369];
on polar bodies in plants, [377].
Strepsiptera, length of life of, [41];
unequal length of life in two sexes, [58], [59].
Succineae, length of life of, [55].
Swans, length of life of, [37].
Tagetes, production of double flowers of, [408].