134 



CELL INTELLIGENCE THE CAUSE OF EVOLUTION 



are in charge of the color business. The following- is a 

 very interesting article on this matter, altho it has been 

 demonstrated several times before, and in one case the 



FIG. 25. Zebra. 



fish was able to produce a checker-board on his back 

 when the bottom of his aquarium was painted in that 

 way. S. O. Mast of Johns Hopkins University has pub- 

 lished in the "Proceedings" of the National Academy of 



