142 C. M. Jackson. 



As iu the case of the kidneys, the left suprarenal gland is usually 

 liU'ger than the right. As may be seen in Table VI, where right and 

 left are given separately, the left averaged larger for both sexes in 

 every month except the 2d, 4th (female), and 6th (female), in 

 which the right averaged larger, and in the 3d month, in which they 

 were equal. 



For a comparison of the right and left suprarenal glands in the 

 adult, I have been able to find no data ; but sus,pect that the left will 

 be found the larger here also. 



Reproductive Origans. 



Only a few observations upon the prenatal sex glands are available. 

 In addition to the data in Table IV, I find the testis in embryo No. 

 147 (2.3 cm.) to form .160 per cent of the total body volume; and 

 in 'Eo. 122 (3.9 cm.) .057 per cent. Welcker, and Brandt (45) cite 

 a case (3d mo.) in which the testis formed .10 per cent of the total 

 body weight; and another (6th mo.) in which it formed .06 per cent. 



In an embryo of the 5th week (1.1 cm.), before the sex could be 

 determined with certainty, the anlage of the sexual gland formed 

 .085 per cent of the total body volume. Beginning with the 2d 

 month and extending up to the 10th mo., the relative size of the 

 testis, in per cent of the entire body, forms the following series: — 

 .16, .056, .10, .040, .045, .060, .080. In the female, from the 2d 

 to the 7th mo., the series for the relative size of the ovary (per cent 

 of entire body) is as follows:— .112, .036, .035, .026, .022. 



In both sexes it therefore appears that the sexual gland is relatively 

 larger in the embryo than in the later fetal stages, and that the testis 

 is much larger than the ovary at corresponding stages. According 

 to Vierordt, in the newborn the testis and ovary are about equal in 

 size, forming .026 per cent of the entire body weight. For the adult 

 he gives .080 per cent for the testis and .012 per cent for the ovary. 



Sheleton, Musculature and Shin. 



While the skeleton, musculature and skin were not observed in the 

 present investigation (except in one specimen), it is perhaps worth 



