ILLUSTRATIONS 

 Plate I 



[Drawing by Julian Castro.] 



A camera lucida drawing of a melanophore of a Philippine house lizard, 

 showing both the pigmented and the colorless granules in the radiating 

 pseudopods. No. 3 ocular, %2 oil immersion objective, reduced about 

 one third. 



Plate II 



Fig. 1. A house lizard, showing the bleaching of the skin five minutes after 

 the application of adrenalin. 



2. A house lizard partly bleached by the injection of 0.1 cubic centi- 



meter of adrenalin chloride (1:10,000) into the posterior lymph 

 sac. The lizards shown in figs. 1 and 2 were kept in the same 

 dark cage during the experiment. 



3. A normal dark lizard. 



4. A normal bleached lizard ten minutes after an injection of 0.1 cubic 



centimeter of 1 per cent chloretone in the right posterior lymph 

 sac; the darkened area of skin overlies the injected lymp sac. 



5. A normal lizard partly bleached by being kept in white surroundings. 



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