MALE-PRODUCTION IN HYDATINA 

 TABLE i— Continued 



531 



of Euglena used in the rotifer experiments was probably greater 

 than in the oxygen tests just described, so that the excess of 

 oxygen in the Euglena dishes in the experiments was probably 

 somewhat more than 62 per cent. 



The decrease of the oxygen content of the water over night, 

 in the Euglena culture, may be in part due to other organisms, 

 since my Euglena culture was not quite pure. In this respect the 

 tests described here apply more correctly to the rotifer experi- 

 ments of this paper than they do to Whitnej^'s experiments. 

 Probably, however, a greater part of this overnight decrease is 



