IN THE SECOND CHROMOSOME. 



31n 



The second-brood data are not ver>' conchisivo. Star-blark is 

 perhaps lower than in first broods; but the black ]>urj)le ourvod com- 

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

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

 exact methods are needed in studying this problem. An exj)orimont 

 with Ciir is now planned in which the females will be transferred 

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

 further discussion would be out of place. 



