Flii. ll'.l— (1.) 



Flc;. n'.l-(L'.) 



k;. ir.l-(:i.) 



Fig. 119. Diagram to illustrate the crtectol the animals' 

 markings shown in Fig. 120. These lour figures show a 

 graduated development from No. 1, which represents nothing 

 substantial, to No. 4, which represents an edge of substance 

 showing against a shadowed cavity beneath. Animals' 

 markings, almost invariably, are on the geuernl principle ot 

 No. 4. 



Fig. 120. Bits of animals' patterns, all repre>cutiiig holes^ 

 i. e.j shadowed cavities over which sharply defined edges 

 "relieve" (like wood, leaves, rocks, etc). Among these are 

 mingled reproductions of actual holes to show b<nv close- 

 is the resemblance. (See Fig. 119.) 



Fig, 119— (4) 



