WEIGHT OF ovaries: WILD NORWAY 377 



slightly less in weight than that of the albino, while that of the 

 female Norway is much below the weight of the hypophysis in the 

 female albino and only a little above that of the male Norway. 

 This serves to put the hypophysis weight in the female albino in 

 high relief — table 205 and chart 69. 



Suprarenals. The weight of the suprarenal glands in both 

 sexes of the wild Norway runs above that for the corresponding 

 sex in the albino — and to about the same degree — as the data in 

 the table show. The data for this gland are not satisfactory 

 in detail, but the general relations above indicated are trust- 

 worthy. The suprarenal weight is particularly modified by 

 caging and domestication — table 206: chart 70. (Watson, C, 

 '07 b.) 



Testes. The testes are consistently heavier in the wild Nor- 

 way- — table 207 and chart 71. 



Ovaries. In the case of the ovaries no valid conclusion can be 

 drawn. As the Norway female does not breed until it is much 

 older than the Albino, which accounts in part for the difference 

 in the size of the ovaries up to 180 grams, and after that the 

 wild Norways had in all probability been actively breeding 

 while the Albinos with which they are compared were for the 

 most part prevented from breeding — table 207 and chart 72. 



GROWTH OF ORGANS — ^WILD NORWAY: REFERENCES 



Brain weight on body weight. Donaldson and Hatai, '11. 

 Size and shape of cerebrum. Sugita, '18. 

 Growth of cortex — thickness. Sugita, '18 a 

 Growth of cortex- — volume. Sugita, '18 a. 

 Number of cortical cells. Sugita, '18 a. 

 Comparison tvith Albino. Donaldson and Hatai, '11. 

 Size of cortical cells. Sugita, '18 c. 

 Size of sympathetic cells. Ping, '21 a. 

 Weight of eyeballs. Jackson, '11. 



Weight of diictless glands, including testes and ovaries. Hatai, '14 a. Watson, 

 C, '07 b. 



