360 



GROWTH OF ORGANS IN RELATION TO BODY LENGTH 



(6) Cranial capacity. Formula (59) gives the cranial capacity 

 on the body weight^ — -a useful datum in many instances. 



2. Spinal cord iveight on body iveight- — table 187. In the case of 

 the spinal cord, the computation was made for the sexes combined 

 by the aid of formula (60). Here again there is a difference 

 according to sex, the male spinal cord exceeding the female by 

 0.2 per cent, and the value for both sexes combined, by 0.1 per 

 cent. Corrections similar to those applied to the brain have been 



TABLE 193 

 Giving the brain weight for each brain weight group, the cube root of the brain weight 

 and the linear measurements for width, length and height of the cerebrum. Nor- 

 way rat. W. B. = Width AB, W. D = Width CD, L. G = Length EG, L. F =^ 

 LengthEF (seefigure 12). Ht. = Height HK (see figure 13) 



made in this case also. Chart 64 gives the graph for the male 

 spinal cord on body weight and the corresponding graph (male) 

 for the Albino is also drawn for comparison. 



Formula (61) gives the spinal cord weight (sexes combined) 

 on the brain weight — sexes combined. 



3. Size and shape of the cerebrum — Sngita {'18). As in the case 

 of the Albino, five diameters of the cerebrum were measured 

 along the lines indicated in figures 12 and 13. The data are 

 presented in table 193 and in chart 65. 



