150 



ANIMAL MECHANISM. 



fore-limbs are much more considerable tliau those of the 

 hinder ones. This fact appears to us to lie constant ; and the 

 inequality of the re-actions is still more marked in tl:" walk- 

 ing pace, her. HIM- the apparatus placed on the \vilhers almost 

 always gives appreciable re-actions, while that on the croup 

 gives scarcely any. 



( >/' tin- iri'i'iniliir tn.t (tint decOUStl). We call that alive 

 trot which gives two distinct sounds to the ear fi r each pace, 

 and we name that irregular, each soir.id of which is in a cer- 

 tain degree divided hy the want of synchronism in the strokes 

 of each diagonal biped. The irregular trot has been met, 

 with in many of our experiments. Occasionally this pace; was 

 continued, and then the want of synchronism existed SOUK - 

 times in the impacts of the two diagonal bipeds, and some- 

 times in one pair only; at other times, on the contrary, tlio 

 trot was irregular only for an instant, at the moment of tin- 

 passage from one kind of pace to another. In nil the experi- 

 ments which we have hitherto made, the want of synchronism 

 depended on the hinder limb being behind the anterior limb 

 which corresponded diagonally with it. 



Fig. -It) represents the notation of an irn'yulitr trot, in 

 which the diagonal impacts leave between them an appre- 

 ciable interval of time. We can recognise this by the 

 obliquity of the dotted lino which unites with each other the 

 impacts of the t\vo diagonal bipeds. 



thu Irregular trot 



The jiixd- .f the trot is represented in fig. -17, according (o 

 Vincent and (Joill'on. All the prints are double, for the 

 hinder-foot al\\ays comes up to take the place of the lore-foot 

 on the same i ide. 



In tig. 17 \\ e have rendered this Superposition imperfect 



