r 



Experiments and their Verification 



129 



the curve is toward left side, showing the left hind on its proper side, 

 -while both fore and the right hind are much farther away from it. It 

 illustrates the force of motion that tends to throw the body toward the 

 outside. 



In the straight course (second diagram), the lines of motion are 

 readjusted to the normal and the feet move in their ordinary lines or 

 nearly so. Fig. 94 illustrates again the almost equal extension of 



V 



straight course (the right fore being now slightly in advance of left 

 fore) and the somewhat lessened extension of right hind over left hind 

 (3 inches). Other experiments have shown that wherever the off hind 



nh 



1 



FIG. 93 



nf of 



LJ 



on 



1 



5/5 A bet-, frogs of fore = -^ in 

 ?/iS/-. bet. frogs of hind = J 9 />o tn 



Distances reduced one. half 

 Dotted line is median line . 



acts in that free forward extension the turns are taken more easily 

 than where it is held back and follows the near hind ; but there should 

 be at the same time a slight but not excessive extension of near fore 

 over that of off fore. If such extension of near fore is excessive and 

 the off fore points back too far in consequence, there is again the 

 danger not only of interference with off hind, but also of lack of support 

 by off fore at the turns. The principal requisites -for taking a turn well 

 arc, therefore, first, a slight increase in forward extension of near fore 

 over off fore, and secondly, a more marked increase of off hind exten- 

 sion to effect the szvinging of the body to the left and to prevent a loss 

 of equilibrium. 



