Do. as a propeller and aërial screw, [256]
Do. compound rotation of: the different parts of the wing travel at different speeds, [252]
Do. necessity for supplying root of, with elastic structures, [247]
Artificial compound wave wing of Pettigrew, [242]
Atmospheric pressure, effects of, on limbs, [24]
Axioms, fundamental, [17]
Balancing, how effected in flight, [118]
Balloon, [210]
Bats and birds, lax condition of shoulder-joint in, [190]
Birds, lifting capacity of, [205]