PLATE is 



EXPLANATION OF FIGURES 



o7. An albinous and a normal frog tadpole showing reciprocal skin exchanges. 

 TikTii four hours after the skin exchange was effected. Age of specimens 70 days, 

 dated from the operative stage. Xo. 



58. Enlargements of the skin exchanges and surrounding region of the specimens 

 shown in figure hi. 



148 



