Muscles take precedence of bones in animal movements, [29]
Muscular cycles, [26]
Muscular waves, [26]
Pendulums, the extremities of animals act as, in walking, [9], [18], [56], [57]
Plane, inclined, as applied to the air, [211]
Pettigrew’s method of constructing and applying artificial wings as contradistinguished from that of Borelli, Chabrier, Durckheim, Marey, etc., [235]
Pettigrew’s wave wing, [236]
Pettigrew’s compound wave wing, [242]
Progression on the land, [37]
Do. on or in the water, [64]