PLATE 4 



EXPLANATION OF FIGURES 



18 Photograph of LN 51 taken sixteen days after the operation. Absorption 

 began along the ventral edge. Two days after this photograph was made, about 

 one-half of the eye was exposed in a dorsal view. No further absorption occurred . 

 X3. 



19 Photomicrograph of dermal melanophores of an animal which had been 

 kept in ice-water (0°C.) for four days. An intricate network of melanophore 

 processes entirely obliterates the limits of individual cells. X 293. 



20 Photomicrograph of dermal melanophores of an animal which had been 

 kept in ice-water (0°C.) for two hours. The cells, which at the beginning of 

 the experiment were completely contracted (fig. 21), are shown to be about one- 

 third expanded. X 293. 



21 Photomicrograph of dermal melanophores of an animal which had been 

 kept in warm water (35°C.) for two days. The cells are maximally contracted. 

 X 293. 



22 Photomicrograph of epidermal melanophores of graft LB 34, showing the 

 parallel arrangement of the melanophores and masses of melanin granules. 

 X 320. 



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