COMPARATIVE LOCOMOTION 



265 



of 45°. A lizard was placed on the glass bottom, and 

 silhouetted on the sensitized plate. But grey or green 

 lizards were unable to crawl on the slippery surface of 

 the glass ; but, on the other band, the Gecko with its 

 spatulated digits could run about with ease. That all 



Fig. 136. Grey lizard. The series must b^ followed from right to left 



these specimens might be under equally favourable 

 conditions for locomotion a piece of muslin was pasted 

 on the surface of the glass. This muslin should be 

 very transparent, and yet rough enough to admit of 



MWW 



j 



Fig. 187.— Gecko. The series must be followed from left to right. 



locomotion. Figs. 186 and 187 show the mode of pro- 

 gression of the grey lizard and the Gecko. Taken as 

 a whole, the paces are similar,* but with the Gecko, 



* See chap. xi. Synoptic chart of the characteristics of the equine 

 trot. 



