§3.2 



CONTROL OF PIGMENTARY EFFECTORS 



71 



[^ 



2 S 



9 



bo 



a o 

 o -^ 



CO 



w 



^1 



I I M 



I I I I 



I I I 



"t- ^ 





«3 '^ 



a -ts 



• S-S ^ 





?^ rt i3 





^3 >4 



ft5 



