Do. Marey, [226]
Do. Chabrier, [233]
Do. Straus-Durckheim, [233]
Do. how to apply to the air, [245]
Do. nature of forces required to propel, [246]
Artificial wave wing of Pettigrew, [236]
Do. how to construct on insect type, [240]
Do. how to construct to evade the superimposed air during the up stroke, [241]
Do. can create currents and rise upon them, [253]
Do. can be driven at any speed; can make new currents and utilize old ones, [251], [255]