324 T. H. MORGAN 



In the third place, the hnkage values of these daughters should 

 fall into two classes corresponding to the two lethals, and since the 

 two lethals are only 8 units apart the curve representing the values 

 should have two modes about 8 units apart. This result also 

 seems to be realized, as shown in diagram 3. 



June, 1914 



