FURTIIKR DATA ON TllK KKDUl'LICATION IN SILKWORMS. 
5 
The union of such fjanictic scries will <;ivc rise to the following 
zys^otic series : 
Clamctic scries Zygotic series 
SY sy SY Sy sY Sy Str. Str. Non-str. Non-str. 
ycl. wh. yel. wli. 
I : I 3:1:1:3 II : I : I : 3 
1:1 2:i:r:2 8:1:1:2 
The ratios 11:1:1:3 and 8:1:1:2 show an approximation 
to the systems 11.80 : i : i : 3.27 (—177 : 15 : 15 : 49 which results 
from the 7 : i coupling on both sexes) and 7.33 : r : i : 1.78 ( = 66 : 9 
: 9 : 16 that is the outcome of the 4 : i series on both sexes) respectively. 
So they seem liable to be mistaken for ordinary 7 : i or 4 : i coupling. 
The actual figures are compared with the numbers expected on the above 
ratios. 
Striped Striped Normal Normal Total 
yellow white yellow white 
II. 1-6, 8, 9'i2 (3 families) 511 52 46 137 746 
Expect, on 1 1 : I : 1 : 3 zyg. ser. 512.9 46.6 46.6 139-9 746.0 
H. 29-i-8'i2 (8 families) 1973 264 261 507 3005 
Expect, on 8 : I : r : 2 zyg. ser. 2003.3 250.4 250.4 500.9 3005.0 
The expectation is, as it is shown, fairly realised. 
2. TWO NEW^ INSTANCES OF THE REDUPLICATION IN 
SILKWORMS. 
Besides those cases of gametic reduplication hitherto described by 
the writer' two new examples were found in the silkworm. One was 
the repulsion between S and Y, while the other was the coupling between 
Hf (normal marking) and Y. 
a) The Repulsion between S and Y. 
This occurred in one (S. io'i3) of the families reared during the 
summer 1913. The origin of the family in question is as follows. 
I 1913 I. c. and 1914 1. c. 
