EFFECTS OF INBREEDING ON BODY WEIGHT 



21 



were quite as inferior to their descendants in body size as were 

 the males in the corresponding generations of the A series 

 (graph D). 



The growth in body weight of various groups of females be- 

 longing in the B series is shown graphically in figure 5 (data in 

 table 2 and in table 9). 



Graphs A to C in figure 5 were drawn so that the lines 

 are distinct. These graphs should lie very close together and 



100 20 40 60 180 ! 200 220 240 260 280 300 320 340 360 380 4O0 420 440 460 480 



Fig. 4 Graphs showing the increase in the weight of the body with age for 

 males belonging to various generation groups of the B series of inbreds (data in 

 table 2 and in table 9: lettering as in figure 2). 



overlap in many places, since the data in table 9 shows that the 

 actual differences between the corresponding body weights of 

 the various groups are very small. The position of graph D 

 indicates that adult females of the first six generations were 

 very much smaller animals than their descendants of like age, 

 as was the case in the A series also. 



The data given in table 8 and in table 9 have been combined 

 in table 10. 



