88 



E. CARLETON MACDOWELL 



that a male may never be larger than this, but the comparison 

 with the females is accurate since males and fema es were both 

 used in each group of flies that was measured. 



In the mass cultures of extra bristled flies the bristle numbers 

 are somewhat lower and the number of normals higher than in 

 the inbred lines, but the flies themselves being raised in larger 

 numbers and so cramped in close together are much smaller 



TABLE 14 



Females. Correlation between size 

 and number of extra bristles 



TABLE 15 



Males. Correction between size and 

 numbers of extra bristles. 



TABLE 16 



To compare children from low grade -parents taken from mass cultures and raised 

 in pairs, with children from high grade parents thathave comefrom continuously 

 inbred lines, selected for increase in bristle numbers 



