2S2 



INDEX. 



1'ettigrew, Dr., on birds' wings, 210 

 Piste, definition of, 152 



of amble, lo'2 



of slow gallop, 167 



of Eclipse's gallop, 167 



of trot, 157 



of walking pace, 162 



I'line on stable equilibrium of birds, 



R. 



Reactions defined, 115 



instruments to show, 116 

 of movements of wing of 

 birds, 264 



of walking (man), 127 



of leap, ditto, 131 

 of gallop, ditto, 131 

 of trot of horse, 153 



of gallop, ditto, 165, 171 

 Regnault's equivalent of heat, 15 

 I.Vssource of birds, 220 

 ]( ymond, du liois, on muscular 



shocks, 50 



IMiythm of paces, 133 

 Running (man), 125 



S. 



Selection, natural, 81 

 Shuc, experimental, 113 



Skeleton, action o[ aneurism on, 87 

 variability of, 85 



change of course and at- 



tachment of 

 muscles, 89 



in, transmitted 



to descendants, 

 94 



hollows worn by tendons 



in, 86 



Snail, movements of, 105 

 Step mrves, 127 



of horse's trot, 1.":; 

 gallop, I 1 '."' 



walk, I'lo 



Stiniiilns <>f necessity. S! 

 S\ nUn tic ri'prodnetinii of move- 

 ments in man, 137 

 in horse, 177 



T. 



Temperature of animals, 23 

 Tetanus, muscular, 45 



from strychnine, 46 



heat developed in. 49 

 Yolta and Weber on ner- 

 vous, 45 



Thermodynamics, 14 

 Torpedo, experiments on, 52 



lost time in, 56 

 Tracings, sec Table of Illustrations, 

 of walking pace (man), 



115 



of running (man), 128 

 of gallop (man), 131 

 of hopping (man), 132 

 of leaping (man), 131 



of movements of insect's 



wing, 190 ct .-"/. 



of action of pectoral mus- 



cles of birds. 1M2 



of (light of wild duck, buz- 



zard, &c., 266 



of Whcatstone's rod with 



wing of wasp attached, 



191 



of humming-bird moth, 

 191 



compared with vibrations 



of chronograph, 121 

 Traction, ell'ects of, ou skeleton, 



89 

 Trajectory of pubis, 119 



of bird's wing, 234-240 

 Transitions in paces of horse, 174 



U. 



Unit of heat, 13 

 of work, 14 



V. 



Veratrino, muscle under, 35 , 



Villenenve, Dr., on birds' wings, 223 

 Vincent and GoilFon on horse, 151 

 Volta and Weber on nervous te- 

 tanus, 45 



