Body and wing reciprocate in flight, and each describes a waved track, [12]
Bones, [21]
Bones of the extremities twisted and spiral, [28], [29]
Bones of wing of bat—spiral configuration of their articular surfaces, [176]
Bones of wing of bird—their articular surfaces, movements, etc., [178]
Borelli’s artificial bird, [220]
Chabrier’s artificial wings, [233]
Elytra or wing cases and membranous wings, [170]
Feathers, primary, secondary, and tertiary, [180]
Fins, flippers, and wings form mobile helices or screws, [14]