viii 



CONTENTS. 



PAGE 



partition of muscular force between the point of resistance and 

 the mass of the body — Production of useless work when the point 

 of resistance is movable . 102 



CHAPTEE II. 



TERRESTRIAL LOCOMOTION (BIPEDS). 



Choice of certain types in order to study terrestrial locomotion — 

 Human locomotion — Walking — Pressure exerted on the ground, 

 its duration and •intensity — Re-actions on the body during 

 walking — Graphic method of studying them — Vertical oscilla- 

 tions of the body — Horizontal oscillations — Attempt to repre- 

 sent the trajectory of the pubis — Forward translation of the 

 body— Inequalities of its velocity during the instants of a 

 pace. . ■ 110 



CHAPTER III. 



THE DIFFERENT MODES OF PROGRESSION USED BY MAN. 



Description of the apparatus for the purpose of studying the various 

 modes of progression used by man — Portable registering appara- 

 tus — Experimental apparatus for vertical reactions— Walking — 

 Running— Gallop — Leaping on two feet and hopping on one — 

 Notation of these various methods— Definition of a face in any 

 of these kinds of locomotion — Synthetic reproduction of the 

 various modes of progression 124 



CHAPTEE IV. 



QUADRUPEDAL LOCOMOTION STUDIED IN THE HORSE. 



Insufficiency of the senses for the analysis of the paces of the horse 

 — Comparison of Duges— Rhythms of the paces studied by means 

 of the ear — Insufficiency of language to express these rhythms 

 — Musical notation — Notation of the amhle, of the walking pace, 

 of the trot — Synoptical table of paces noted according to the 

 definition of each of them by different authors— Instruments 

 intended to determine by the graphic method the rhythms of the 

 various paces, and the re-actions which accompany them . .138 



CHAPTER V. 



EXPERIMENTS ON THE PACES OF THE HORSE. 

 Double aim of these experiments ; determination of the movements 

 under the physiological point of view, and of the attitudes with 



