'4 
V. TAN A IC A. 
Aiik)1\l:^ the four families deri\'ecl from II. 31 '12, the result in (i) is 
ex{)hune(l ou the basis of the usual system of reduplieation of S-Y coup- 
ling', the results in the rest show, on the contrary, tjuite a distinct feature. 
In these latter families we find only two zy<^otic forms in nearly equal 
ratio, the actual numbers in total bein<;- 
Str. yel. Nor. wh. 
Nos. 2, 3, 4 all together 582 580 
We cannot consider above results as due to a complete coupling of 
an ordinary nature, because we should expect, if such were the case, double 
dominant and double recessive fornix in the ratio 3 : i instead of 1 : i 
ratio which was attained by the present families. 
If the simultaneous dropping out of the factors S and Y in the male 
parent has been assumed, above results may be simply explained. But we 
have at present no positi\'e evidence in support of this assumption 
4. ON THE GENETIC CONSTITUTIONS OF THE STRIPED 
AND MORICAUD MARKINGS. 
The question dealt with here concerns whether the genetic constitu- 
tions of the striped and moricaud markings (in homozygous condition) are 
SSnn and MMim respectively, or are actually SSNN and MMNN". 
As experimental results described elsewhere show, F^ families ex 
striped x normal involved only striped and normal individuals, but no 
other marking, plain for instance. On the basis of SSnn view, on the 
other hand, we are to expect three forms of marking in F.,, i.e. striped, 
normal and ssnn markings. As this did not actually happen, however, we 
must, for e.xplanation of the phenomenon, assume a complete replusion 
between S and N. 
If the formula SSNN was accepted, on the contrary, above result is 
simpi)- analysed without need of assuming any reduplication, but another 
difficulty occurs here. In F., ex SSNN x ssnn (i)lain) we should expect 
I. (2 : I : 1 : 2) -5 X Cl : I) Cf. p. 5. 
