II. SIZE OF THE BODY AND OIUJAV- 



79 



brain weight represented by them. The data for these parts 

 do not begin until G 3 . 



In chart 14 the percentage deviations of the brain weight 

 are entered and also the percentage of the weight of the brain 

 represented by the olfactory bulbs and by the paraflocculi. 

 In charts 15 and 16 the limiting values for the deviations in 

 brain weight are shown for each generation. Examination of 

 chart 14 shows that the brain weight in the captive Grays is 

 slightly deficient, but with fluctuations. 



These deficiencies tend to follow the same course in the 

 two sexes, but are slightly greater in the males, and in both 

 sexes slightly greater in the last five generations, even when 

 the entries at G 7 and G H , which mark a sag in tin- graph, are 

 excluded. 



TABLE 13 



On the weight of the brain in the captive Grays and on tin ilt riation* from the 

 corresponding standards for body weight and body length. Chart 14. Male* 



'As the values for the brain weight <m observed body length arc average* for 

 the values in table 187 for the brain weight on the body length of each individual 

 case, and as this assumes that the graph between the extremes is a straight line, 

 which it is not, these averages differ slightly, by tenths of a per , nt. fr,.m tin- 

 values to be expected for the average body lengths that have been iwd. 

 deviation is neglected. The same comment applies to the other organ values In 

 the several tables. 



