l^orth CaroWifvSLate Library 

 Raleigh 



CONTEIBUTIONS TO THE GENETICS OF 

 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. 



J C 4, * ^ , .. » • . -> 



I .1 ""s * 



, , > ) > 1 , ) ) ' 1 



Published by the Carnegie Institution of Washington 



Washington, 1919 



