184 Toyama. 
and 46 described in Table 4 the segregation of the recessive character 
is not complete, as was the case in No. 29 for the dominant character. 
Similar cases of seeming exception to Mendel’s law are mentioned by 
Correns. 
Of the 65 pairings of red worms, all yielded uniform red offspring, 
except one mating No. 2 from parentage No. 26, which produced 
187 red worms and 194 blacks, that is to say, nearly in the proportion 
of ı red: 1 black. I accounted it to be a case of (D+R)><R which 
is due to the mixing of some hybrid black worms to the red group 
during the rearing. If so, every mating of the black worms should 
produce red and black worms in the proportion of 1 red to 3 blacks 
in the next generation. The result of the next generation will 
confirm this. 
The fourth generation (F,). 
In this generation, we kept for experiment 
1. Red worms from parentage No. 26 of the last generation, 
2. Red worms from the mixed parentage of the last generation, 
‘ Red worms ) From the mating No. 2 of parentage No. 26, 
3 
red worms, which produced red and black 
wormsin nearly equal proportion (see Table 3). 
b) black worms 
They mounted on the first to fifth, Sept. 1906 and the moths 
emerged 18—22 Sept. 1906. 
72 pairings were made, in which the offspring of the red matings 
remained constant, while those from the black ones produced, as we 
expected, red and black worms in the proportion of 3 blacks to 1 red. 
Table 6 and 7 give the details of the experiment. 
Table 6. 
Offspring from the mating between red worms. 
I and 2. 
Date of Numbers of egg- Date of Kind of worms 
No NER: F 
oviposition batches hatching hatched 
I 14/9/06 3 16/4/07 All red worms, no 
black. 
18—22/9/06 5 do. do. 
2 17/9/06 32 24/4/07 do. 
40 matings produced red worms with no exception. From the 
first appearance they remained true to the parent. 
