Abstraction, power of, in animals.
Acalles, stridulation of.
Acanthodactylus capensis, sexual differences of colour in.
Accentor Modularis.
Acclimatisation, difference of, in different races of men.
Achetidae, stridulation of the; rudimentary stridulating organs in female.
Acilius sulcatus, elytra of the female.
Acomus, development of spurs in the female of.
Acridiidae, stridulation of the; rudimentary stridulating organs in female.
Acromio-basilar muscle, and quadrupedal gait.