126 



THE SECOND-CHROMOSOME GROUP 



tion, and the earlier experiments were relatively simple. In the case 

 of several of the mutants found very early, little more than a review 

 of the extensive work already published has been given. 



A chronologically arranged list of all these mutants, together with 

 a summary of main points with respect to their origin, locus, etc., is 

 given in table 1. 



TABLE 1. Chronologically arranged list of 1 1 -chromosome mutant genes treated in this paper. 



*Tha mutations marked with the asterisk (*) are no longer on hand, having been lost or discarded. 



