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A. FRANKLIN SHULL AND SONIA LADOFF 



TABLE 12 



Showing the effects of continuous rearing of the rotijers in water containing Spi- 

 rogyra, as in Table 11. Two lines were reared in Spirogrjra cultures, with a single 

 control 



TABLE 13 



Recording the offspring of parents reared in Spirogyra cultures, as contrasted with 

 those of parents reared in the absence of Spirogyra. All offspring were reared in 

 spring water. Spirogyra used in this way does not increase male-production. 

 See also tables 11 and 12 



