574 



PRINCIPLES OF GENERAL PHYSIOLOGY 



4d\ 



4 f, 



FIG. 182. Similar views to those of the preceding figure, on backgrounds of regular black and 

 white patterns. The imitation of the smaller pattern is better than that of the larger 

 one. In the latter cases, although there are large patches of black and white on the 

 fish, their shapes do not verj r closely correspond with those of the background ; there 

 is, however, a distinct indication of square or circular areas, respectively. 



(Sumner, 1911.) 



