REPRODUCTIVE ORGANS IN THE PRIMULACER. 119 
the grand ends of sexual dimorphism is the erossing of distinet 
individuals, we have, in this imperfeet self-fertility, indieations of 
a desire in nature to facilitate similar conjunctions in this non- 
dimorphic species. As it might be supposed, however, that this 
imperfect self-fertility was due to a differentiation of a flower's 
own pollen to its own stigma, I may expressly state that the 
complete fertility of the artificially fertilized flowers was the 
result of fertilization in every instance by the flowers own 
pollen. There can be no doubt, therefore, that the imperfect 
fertility of the unartificially fertilized flowers was simply owing to 
the stigmas being insufficiently supplied with pollen. As further 
supporting this, I may also state, that in my tables where the 
amount of seeds produced by each capsule is stated separately, 
much less variation in the amount is presented by those artifi- 
cially than those naturally fertilized. 
TABLE XIII.— Primula Scotica. 
De D KS : a" i De 5 
oe O9, ee OF o 3 
n n E E D 2 H m g © n 
BE | BES | Ess | S38 | ose 
BE Tor E23 sou SES 
Qe o a co 
LO nm Ln = g o wu 
Pa as KE 2 DG > 5 
A wk "lm, ^ie IM e 
Flowers carefully protected 
from all external fertilizing 
EE 10 a 6 568 95 
Flowers protected from in- 
sects, and artificially ferti- 
HEBEN X 6 4 852 213 
Flowers protected from in- 
sects, and artificially ferti- 
lized sa ui 14 9 1249 139 
Flowers unprotected, and 
freely exposed to insect and 
other agencies: 9 555 a 13 8 1426 178 
2. Primula mollis.—The relations of anthers and stigmas in 
this species, as in the preceding, are highly favourable to self- 
fertilization, the latter organs being closely surrounded by the 
former, and included within the tube of the corolla. In respect 
to its regular self-fertility, it greatly exceeds all the other species 
with which I have any acquaintance, inasmuch as nearly every 
flower produces a capsule filled with good seed; whereas in the 
other non-dimorphie species which have come under my observa- 
tion there is very generally a high percentage of abortive capsules, 
together with a great variability in the number of seeds contained 
in those that do set. Though I had never seen the flowers of 
