The Behavior of tlie Chromosomes as Studied through Linkage. 275 



Loci V and M. 



Repulsion. VM Vm vM vm 



Sturtevant '13 ... 14 265 291 3 



Coupling. 



New data .542 22 12 492 



Grand total, V and M, 50/1640 = S'OS — . 



Loci V .and R. 



Repulsion. VR Vr vR vr 



Sturtevant '13 ... 105 33 316 4 



New data 42 114 204 .32 



Total 147 147 ".20 36 



Grand total, V and R, 183/8.Ö0 = 21-53—. 



Lori V and Br. 

 Coupling. VBr Vbr vBr vbr 



Tite '14 200 977 874 2912 



Grand total, V and Br, 1851 y 7323 = 25-29 +. 



Loci M and R. 



Repulsion. MR Mr mR mr 



Morgan '12 4,30 795 1716 189 



Coupling. 



Morgan '12 4189 93 850 1033 



Grand total, M and R, 1562/9295 = 16-80+. 



Loci 31 and Br. 



Coupling. MBr Mbr mBr mbr 



New data 1046 282 2.56 1081 



Grand total, M and Br, 538/2665 = 20-19—. 



Loci R and Br. 



Coupling. RBr Rbr rBr rbr 



New data 100 6 1 52 



Grand total, R and Br, 7/159 = 440+. 



Chromosome II. 



Back cross tests of doubly heterozygous females. 

 All offspring other than those obtained from first cultures have been omitted, 

 for reasons which will appear in later publications from this laboratory. 



Loci B and Vg:. 



For most complete results see Morgan, Biol. Boll. XXVI, 1914. 



Lo<-i B and Cv. 

 Repulsion. BCv Bcv bCv bcv 



SturtevantandBridges'14 644 2292 2148 663 



Coupling. 

 SturtevantandBridges'14 610 184 226 652 



Grand total, B and Cv, 1717/7419 = 2-3-1. 



19* 



