162 On the Species of the Genus Primula in Essex. 
small to be reliable. Taking all the observations together we 
see that the number of 1. when compared with the number of 
s. is as 100 to 84, thus showing a great difference—almost as 
great, in fact, as was the case with P. elatior. 
I examined on three occasions, in the beginning of July, 
166 plants of P. latifolia growing on Pitz Rosatsch and Pitz 
Corvatsch, of which 86 were short- and 80 long-styled, thus 
giving, in this species, a majority of 6 to the s. On one 
occasion only the 1. outnumbered the s. (8 out of 19), 
and on the other two the s. were slightly the more 
numerous (by 6 out of 112 and by 3 out of 35). 
On the 8th of July I gathered two lots of 66 plants together 
of P. viscosa growing on the side of Pitz Rosatsch. In the 
first lot the s. had a majority of 8 out of 22, and in the 
second they were in a minority of 4 out of 44. Together, 
therefore, the s. have only a majority of 4. 
With P. candolleana, on which I have only made one 
observation, the case is different. Of 89 gathered on July 
11th, on the top of the Muot Marmore, 30 were s. and 59 1., 
thus giving the latter a majority of almost exactly 2 to 1. 
These, then, are the grounds on which I rest my belief 
that in Nature the long-styled plants, as a rule, outnumber 
the short-styled plants by a considerable majority. To arrive 
at this conclusion I have examined 13,201 plants, and have 
further shown that in one species at least the very finest 
plants generally appear among the long-styled ones. 
The result of my countings at first rather surprised me, as 
it seemed most reasonable to suppose that, seeing the two 
forms require to be reciprocally fertilized, they should live 
together in equal numbers; and it appeared to me that if 
one form were to become more numerous than the other the 
balance would soon be evenly adjusted, because there would 
not be enough plants of the opposite form fully to fertilize 
those which were most numerous ; and they would thus pro¬ 
duce few seeds, whilst the number of plants of this form 
would in all likelihood completely fertilize the plants belonging 
to the other form, which would thus produce their fullest 
complement of seeds. By this means the numbers might be 
equalized, but it does not seem to be so. I am as yet 
altogether in the dark as to the reason of the greater abundance 
of the long-styled plants, and it would be interesting to know 
