A Sport of the Silk-Worm, Bombyx Mori L., and its Hereditary Behavior. 187 
Every mating yielded only black worms. They mounted on 
21—22nd May 1907 and the moths emerged 6—ra2th, June 1907. 
From these moths 231 matings were obtained. All the matings 
produced red and black worms nearly in the proportion of one red 
to three blacks, exept one mating which yielded only black worms. 
From them, we selected at random 89 matings and counted the 
respective number of red and black worms in each mating. The total 
number, as Table 10 shows, was 32,271, of which 8,173 (25.32 %), 
were red and 24.098 black. In single cases, however, the proportion 
of red and black worms varied from 19.79 : 80.21 to 33.33 : 66.66. 
Table to. 
No. Number of matings] Red worms Black worms | Total 
Gi 25 matings 2,181 | 6,747 8,928 
G 2 21 matings 1,674 4,684 6,358 
Ba 23 matings 2,174 6,654 8,828 
E 3 20 matings 2,144 6,013 8,157 
Grand total 89 matings 8,173 24,098 32,271 
Now we see clearly that the character “red” is recessive towards 
“black”, a character of different lineage, according to Mendel’s law 
of heredity. 
Résumé of the results obtained on the inheritance of the red 
and black characters: 
© Univoltine black worms = G Tetravoltine black worms. 
The first All black worms (18 matings). 
generation 627 matings 
The second 490 Matings 137 matings 
generation (Mixed offsprings) 
ze a Wr BERNER 
Uniform blacks| 110 matings 27 matings. 
only blacks. Red (2103) + black (7162). 
The third Only blacks. | Discontinued. 65 matings 22 matings. 
generation All red, except one |Red (1363)+ 
mating in which Black (4634) 
red (187) + black (194).] 40 matings. 
The fourth Blacks only. 16matings 16matings All red. 
generation All reds. Red (881)-+-] Discontinued 
black (2529). 
