;10 Proceedings of Indiunu Academy of Science. 



Table XVI. F2 generation from straight black 9 by gray curved cf. 



2. Curved 9 by black cf • 



The reciprocal cross in wliich the curved 5 is mated to the black j\ gave 

 all wild type in tlie F, generation. These inbred gave results as given in 

 table XVII. These results sliow very clearly that there Is linkage between 

 black and curved since the double recessive does not appear in F,. 



Table XVII. F2 generation from gray curved 9 by straight black ( 



3. Curved 9 by black purple curved cf. 



Tables XVIII and XIX give additional data in which curved was crossed 

 to the triple recessive black purple curved obtained from Morgan in the fall 



of 1918. T he curv^ed 9 by the black purple curved cT eave 200 gray red 

 eyed curved sons and 218 gray red eyed daughters. The fact that all the Fj 

 had curved wings is conclusive proof that IMorgan's curved stock and mine 

 are identical. The independent change affecting the germ plasm had changed 

 identical genes. Matings were made from the Fi with the results recorded 

 in table XVIII. 



