If A.T1TRAL SmWN MPT. 



CONTRIBUTIONS TO THE GENETICS 

 DROSOPHILA MELANOGASTER. 







I. THE ORIGIN OF GYNANDROMORPHS. 

 BY T. H. MORGAN and C. B. BRIDGES. 



II. THE SECOND CHROMOSOME GROUP OF MUTANT 



CHARACTERS. 

 BY C. B. BRIDGES and T. H. MORGAN. 



III. INHERITED LINKAGE VARIATIONS IN THE SECOND 

 CHROMOSOME. 



BY A. H. STURTEVANT. 



IV. A DEMONSTRATION OF GENES MODIFYING THE 

 CHARACTER "NOTCH." 



BY T. H. MORGAN. 



. 



PUBLISHED BY THE CARNEGIE INSTITUTION OF WASHINGTON 

 WASHINGTON, 1919 



