360 



GRACE MEDES 



hours. The unusually great increase of average size must 

 have been due to the large death-rate which gradually ehmi- 

 nated all but the most nearly normal by the 72 hour period. 

 By this time all were less active and, in solutions c and d, were 

 disintegrating. 



In the corresponding experiments of the following year the 

 controls were far below the general average at the age of|24 



Plot 7 



Plot 8 



hours, but they then grew so rapidly that on the last two days 

 they were the extreme high variants on the growth-curve, 

 Plot 1 E. 



The skeletons undergo characteristic modifications. All the 

 parts are more slender than in the normal, as shown in figure 41, 

 drawn from an individual of solution h at the 72 hour stage. 

 A comparison with figure 40, representing one of the control at 

 the same age, demonstrates the lighter structure of all the parts. 



