392 



GRACE MEDES 



Plot 17 



Plot 18 



These two experiments were performed very late in the sum- 

 mer of 1914, and, as may be seen, even the controls developed 

 so slowly that they did not possess skeletons at the age of 24 

 hours. In Experiment 18, however, rate of growth was fairly 

 rapid the following day and at the age of 48 hours the speci- 

 mens were 10.5 per cent smaller than the average for that period. 



In these cultures we find some of the modifications typical of 

 hypertonic solutions and some of those specific to NaCl. Fig- 

 ures 105 to 116 constitute a series of drawings from the various 

 cultures of Experiment 18. In solutions of pure sea- water 



