Langley, Experiments of, 9, 62, 99, 109 „ on the flight of birds, 11, 22 „ on the power exercised by birds, 12 “La Patrie,” 124 Lifting effect of aeroplanes, 5 „ surface of aeroplanes, 103 Low temperature of space, 15 Major Baden Powell’s demand, 125 Mistral, The, 21 Motors, Development of, 31 Motor, The Antoinette, 89 My compound engines, 142 „ experiments with aeroplanes, 7 „ „ large machine, 10, 133 „ steam engines, 155 Newton’s Law, 2, 6 “Nulli Secundus,” 28, 121 Oil engines, 154 Philipps’ experiments, 9, 118, 119, 145 „ sustainers, 145 Pneumatic buffer, 90 Position of screw, 49 Power exerted by a land animal, 13 „ required, 100 Principally relating to screws, 31 Rayleigh’s experiments in reference to Newton’s law, 6 Recapitulation of early experiments, 130 Recent machines, 109 Relative value of woods for flying machines, 85 Reserve energy necessary in flying machines, 30 Resistance encountered by various shaped bodies, 52 Rotating arm experiments, 64-72