IN THE SECOND CHROMOSOME. 



315 



TABLE 10. C// P . 



TABLE 11. C/ Jr . 



The second-brood data are not very conclusive. Star-black is 

 perhaps lower than in first broods; but the black purple curved com- 

 binations, for which there is more adequate data, all give a slight in- 

 crease. As is shown by the data presented by Plough (1917), more 

 exact methods are needed in studying this problem. An experiment 

 with C/j r is now planned in which the females will be transferred 

 every two days. Until data from such an experiment are available 

 further discussion would be out of place. 



