PLATE 19 



EXPLANATION OF FIGOKES 



59. The mesonephroi and adrenal bodies, fixed in the osmium-bichromate solu- 

 tion, (a) 'Partial' albino young adult frog (specimen p. 7). (b) Normal young 

 adult frog (specimen 33). (c) Albinous frog larva. Age of specimens 356 days. 

 Specimens a and b are shown in figure 53. 



60. An albinous (a) and a thyroidles.? (b) frog tadpole photographed to show the 

 fat-bodies. Taken immediately after death. These specimens had been subjected 

 to inanition for six weeks prior to death. Age 335 days. X2. 



150 



