IN THE SPECIES OF PRIMULA, 87 
lens with respect to the two stigmas in P. veris, Sinensis, and 
auricula. In each species four crosses can be tried; namely, the 
stigma of the long-styled by its own-form pollen and by that of 
the short-styled, and the stigma of the short-styled by its own- 
form pollen and by that of the other form. It is necessary to use 
and remember two new terms for these crosses: when the long- 
and the short-styled stigmas are fertilized by their own-form pol- 
len the union is said to be * homomorphie ;" when the long-styled 
and short-styled stigmas are fertilized by the pollen of the other 
form, the union is “heteromorphic.” I speak of the “own-form 
pollen," because in the following homomorphie unions, in order 
to make the experiment perfectly fair, I never placed the pollen 
of the same flower on its own stigma, but, to avoid the possible ill 
effects of close interbreeding, I always used the pollen from an- 
other plant of the same form. In the following experiments all 
the plants were treated in exactly the same manner, and were 
carefully protected from insects as far as that is possible. I per- 
formed every manipulation myself, and weighed the seed in a che- 
mical balance. Some of the capsules contained no seed, or only 
two or three, and these are excluded in the column marked * good 
pods.” First for P. Sinensis, as the simplest case. 
Primula Sinensis.—TABLE I. 
of long-styled (hete- 
| romorphie union) 
| 
Saal 9 4 5. | 3. By Calculation. 
BES EFFE EE | 258 Gooa ( Weight of 
| ` BCE- 1 d 
ESETE RAO ERAS fe mu 
| 
Long-styled by own-] | | | i 
form pollen Thomo- 20 | 18 13 | 59 | or as 100 to 45 
,Ioorphie union) . | | 
ng-styled by pollen | | | . 
ofshort-styled (hete- >}, 24 | 18 | 16 9:3 | or as 100 to 58 
| gy romorphie union)... J | | | | 
ort-styled by own- ) | i | >. 
form pollen Thomo. | | 7 | 5 4 | 0-9 | or as 100 to 22 
gy morphie union) .. | | 
t | . 
of lon aty loa d 8 8 8 | 61 | or as 100 to 76 
Summary : | i 
| Thetwohomomorphic] 97 | 93 | i1; | 68 
| 
| unions ..............s- | | 
| The two heteromorphic } | 32 | 96 | 24 | 15:4 
|  unioms.. .............. | | | 
For the sake of comparison, we may reduce these latter figures 
as follows : — 
