506 



S. O. MAST 



two of the most accurate and extensive series of readings ob- 

 tained, one for negative and one for positive individuals, are 

 presented in table 9. By referring to this table and table 15 it 

 will be seen that these results show fairly conclusively that the 

 distribution in the spectrum of stimulating efficiency for indi- 

 viduals when they are positive is the same as it is when they are 

 negative; and that it is essentially the same for Gonium as it is 

 for Euglena and Trachelomonas. 



TABLE 9 



For description of table see legend table 2, p. 492. 



Pandorina inorum 



Pandorina was found at Nela Pai'k more nearly continuously, 

 more widely spread and more abundantly throughout the sesaon 

 than any other form studied. The colonies were often so numer- 

 ous that the water in which they lived appeared distinctly green, 

 and frequently the solutions in which they were found contained 



