448 



THEOPHILUS S. PAINTER 



were made to determine what was the best time to shake the 

 eggs. The results of these different experiments are given in 

 the tables below. From these it will be seen that when eggs 

 were shaken between four and eight minutes after fertilization, 

 the largest number of monasters were produced. 



The extreme variability which monaster eggs show in their 

 later behavior has been noted by Wilson ('01 a), Boveri ('03) 

 and myself ('15). For the sake of clearness I have given the 

 main paths of divergence, as I have found them, in the following 

 scheme. 



TABLE 1 

 Experiment of March 2 



TABLE 2 

 Experiment of March 4 



MINUTES AFTER 

 FERTILIZATION SHAKEN 



4 



6 



8 

 10 



NUMBER OF NORMAL 



221 

 480 

 200 

 500 



NUMBER OF MONASTER 



26 



5 



25 



PERCENTAGE OF 

 MONASTER 



21.0 

 5.2 

 2.5 



5.0 



TABLE 3 



Experiment of March 11 



MINUTES AFTER 

 FERTILIZATION SHAKEN 



NUMBER OF NORMAL 



NUMBER OF MONASTER 



PERCENTAGE OF 

 MONASTER 



3 

 5 

 7 

 9 

 11 



380 

 395 

 296 

 202 

 300 



12 

 51 

 32 

 27 

 



3.0 



10.0 



10.0 



10.0 







