AN ANALYSIS OF THE EFFECT OF SELECTION. 15 
INBRED MINUS SERIES. 
As in the case of the inbred plus series, two lines were carried on 
here. One of these was not kept long; but its history is given here, 
chiefly because it was used in producing the crossbred minus line. 
900 Linz. 
Culture 900 produced Dichet flies as shown in table 11. 
This culture was produced by mating a male 
from the sepia, spineless, kidney, sooty, rough Gunsehee 
1 
D' r, Bristles. | Offspring. 
stock to a female of the constitution =e that zubad — 
e 4 32 
was obtained by inbreeding a pair of flies from 5 22 
869 (see pedigree of 1002 inbred plus line). 6 = 
869 was produced by a male from the sepia, | Total..... 67 
spineless, kidney, sooty, rough stock and a fe- 
male from 854, which came from 839 (9?) and 840 (<7). 840 also 
enters into the pedigree of the 868 line, below. 839 and 840 were 
sister pairs, the males coming from the sepia, spineless, kidney, sooty, 
rough stock, and the females being F, hybrids of the sepia, peach, 
ebony, and Dichet stocks. 
7 7 
4 4 
3 3 
2 2 
‘ 4 Se a 
SS ee 
3 4 5 6 7 8 9 10 1 2 3 4 6 6 47 8 9 WU 
Fig. 5. Fig. 6. 
Fic. 5.—Means and standard deviations for crossbred plus line. 
Fic. 6.—Means and standard deviations for 900 inbred minus line. 
Table 12 and the curve (fig. 6) for this line are arranged in the same 
way as those for the inbred plus lines. 
