



AS CAUSE OF THE APPARENT CONSTANCY OF THE MUTANT „SPREAD”. 325 
I. Spread X normal type and reciprocal 1). 






Spr Vit spr Vit | Spr Vit= | spr ie 
Theoretically: ———— en : — 
y spr vit x spr Vit ar 1 spr Vit | spr Vit 
ELEM OtY DG eee Tote rs At See rc. a en. este 
| (new type) (new type) 
| Spread Normal 
se | oe. | 99 | de 
X K 13 30 | 36 28 31 
K 15 28. | 24 1719 | 30 
K 42 1 39 | 43 | 47 51 
K 68 TE OLS 
XK 76 ZA 2317818 
Kenai 63 | 48: 53: | 36 
X K 158 Isp ie Tout 18 721 
217 199 195 | 198 






Found in all. . . 416 | 393 
Theoretically. . . 404,5 | 404.5 
Thus it will be seen — as already mentioned — that a crossing 
of Spread with the normal type constantly gives a segregation at 
once in F,, as equal numbers of normal and Spread indivuals arise. 
II. Spread (new type) X normal (old type). 
Spr Vit spr Vit ne Spr Vit ; oe spr Vit 
Theoretically : spr Vit x spr Vit — | spr Vit Es spr Vit 
Spread | normal 
Bhenotvpe ces, de ee | FOR à | (old type) 

1) In the tables is put a X off the culture-numbers that represent 
crosses, which are in accordance with the head of the table. The reciprocal 
crosses have no sign. 
