IN THE SECOND CHROMOSOME. 



:^ii 



Table 6 shows the resuhs obtained from second broods,' prcnluced 

 by feniales containing a Nova Scotia chromosome. TliescJ data were 



Table 5— Tests of all females bearing one Nova Scotia chromosome 



{region from star almost to speck). 



collected in order to find out if there is a change in the linkage value 

 as a female grows older. The percentages are so small, however, that 

 a comparison with, first broods can give no significant result. The 

 small percentages also make impossible a satisfactory study of 

 coincidence in tables 1, 3, and 4. 



Table 6. — One original Nova Scotia chromosome, second broods. 



Loci. 



S'b.. 

 S'Pr. 

 S' c. 

 S' Sp. 

 b Pr.. 

 be... 

 b nif. . 

 b Sp. . 

 Pr C. 

 Pr rrir. 

 Pr Sp. 

 c rrif . . 



Percentage. 



0.0 



0.9 

 0.0 

 0.0 



Culture 69, referred to above (p. 307), contained a femiile of the 

 Nova Scotia^ ^^^^^ ^^ ^ ^,^ ^^ ^^^^ ^^^ vestiguil male, 



constitution 



Vg Sp 



produced by crossing-over and possessing, presumably, only the ex- 



'" First brood" and "second brood" are terms applied to the offsprinR produced when a 

 female is kept in one bottle for 9 or 10 days (first brood), and then transferred to another bottle 

 for a second period of 9 or 10 days (second brood). The division is an arbitrar>' one. and doee 

 not correspond to any "rhythm" in the production of eggs. 



