336 



GRACE MEDES 



TABLE 2 

 Constants, Experiment 1. Solution b 



24 hours 



48 hours 



72 hours 



96 hours ^ 



120 hours 



Right »anal . 

 Left anal. . 

 Right oral. 

 Left oral. . . 



Right anal. 

 Left anal. . 

 Right oral. 

 Left oral. . . 



Right anal. 

 Left anal. . 

 Right oral. 

 Left oral. . . 



Right anal. 

 Left anal. . 

 Right oral. 

 Left oral. . . 



f Right anal. 



j Left anal. . 



I Right oral. 



Left oral. . . 



16.51 

 16.59 

 16.51 

 16.59 



59.76 

 59.81 

 44.56 

 44.60 



74.21 

 74.04 

 52.60 

 52.65 



76.85 

 76.85 

 61.81 

 61.73 



77.00 

 76.89 

 67.69 

 67.65 



0.35 

 0.34 

 0.35 

 0.34 



0.33 

 0.34 

 0.26 

 0.26 



0.29 

 0.29 

 0.26 

 0.26 



0.28 

 0.29 

 0.23 

 0.22 



0.27 

 0.27 

 0.20 

 0.20 



STANDARD 

 DEVIATION 



5.19 ± 0.24 



5.17 ± 0.24 



5.19 ± 0.24 



5.17 ± 0.24 



5.00 

 5.06 

 3.86 

 3.90 



4.40 

 4.39 

 3.89 

 3.97 



4.29 

 4.37 

 3.44 

 3.39 



4.13 

 4.09 

 3.08 

 3.08 



0.23 

 0.24 

 0.18 

 0.18 



0.20 

 0.20 

 0.18 

 0.18 



0.20 

 0.20 

 0.16 

 0.16 



0.19 

 0.19 

 0.14 

 0.14 



coEa^TiciENT or 



VAHIATION 



31.47 

 31.21 

 31.47 

 31.21 



8.37 

 8.46 

 8.67 

 8.74 



1.64 

 1.62 

 1.64 

 1.62 



0.40 

 0.40 

 0.41 

 0.42 



5.93 ± 0.28 



5.93 ± 0.28 



7.41 ± 0.35 



7.54 ± 0.36 



5.58 

 5.59 

 5.57 

 5.50 



5.36 

 5.32 

 4.55 

 •4.56 



0.26 

 0.27 

 0.26 

 0.26 



0.25 

 0.25 

 0.21 

 0.21 



stage. In solution g, cleavage occurred, though slowly and 

 irregularly, and resulted in somewhat abnormal looking blastulae ; 

 but at an age of 24 hours almost all of them had died, while 

 none of those remaining showed evidences of forming skeletons. 

 The most characteristic modification produced in the skeleton 

 was reduction of the typical structures. This may be seen 

 especially well in figures 18, 19 and 20, representing a, b and 

 c at the. age of 96 hours. In 6, the spines were less prominent, 

 the dorsal body-branches were smaller and the ventral body- 

 branches less complex. In figure 20, all these modifications 

 are more pronounced. In the more dilute solutions a retarded 

 fusion of the transverse rods and of the posterior ends of the 

 body-rods generally occurred, as may be observed in c at the 

 age of 96 hours (fig. 20). 



