Sight, inheritance of long and short.
Signal-cries of monkeys.
Silk-moth, proportion of the sexes in; Ailanthus, Prof. Canestrini, on
the destruction of its larvae by wasps; difference of size of the male
and female cocoons of the; pairing of the.
Simiadae, their origin and divisions.
Similarity, sexual.
Singing of the Cicadae and Fulgoridae; of tree-frogs; of birds, object
of the.
Sirenia, nakedness of.
Sirex juvencus.
Siricidae, difference of the sexes in.
Siskin, pairing with a canary.
Sitana, throat-pouch of the males of.
Size, relative, of the sexes of insects.
Skin, dark colour of, a protection against heat.
Skin, movement of the; nakedness of, in man; colour of the.
Skin and hair, correlation of colour of.
Skull, variation of, in man; cubic contents of, no absolute test of
intellect; Neanderthal, capacity of the; causes of modification of the;
difference of, in form and capacity, in different races of men;
variability of the shape of the; differences of, in the sexes in man;
artificial modification of the shape of.
Skunk, odour emitted by the; white tail of, protective.
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