82 MR. J. SCOTT ON THE FUNCTIONS AND STRUCTURE OF THE 
senting an equality in the length of the sexual organs. The 
anthers are attached to the tube of the corolla about one-third 
below its mouth, and closely surround the flattened disk-shaped 
stigma, which usually reaches their apices. 
Fourth.— Primula Scotica affords us an indigenous illustra- 
tion of the “non-dimorphic” structure. In native specimens I 
find the anthers usually surround the mouth of the corolla-tube, 
while in cultivated specimens I have in general found them 
attached about one-third below its mouth; in either case, how- 
ever, the length of the style varies similarly, the stigmas in both 
being closely appressed by the anthers. 
Fifth, Primula Sibirica—Of this species two varieties are 
known, one with oblong entire leaves, the other with ovate cre- 
nated leaves. I have examined a number of native specimens of 
the former variety, all of which were truly dimorphic; of the 
latter I have seen cultivated specimens only, which, on the other 
hand, had stamens and pistils of an equal length. "Whether 
native specimens of the latter are similarly charaeterized I know 
not; but it is not at all improbable that the “non-dimorphic” 
strueture in the cultivated specimens is due to an abnormal 
development, as I have frequently observed flowers on distinct 
plants with the anthers assuming a petaloid form. Mr. Darwin 
in his paper above referred to (p. 81) mentions a case of non- 
dimorphism also in this species; he suggests, however, that it 
may possibly be due to an abnormal development of the anthers. 
Until further evidence is afforded of the structural condition of 
the P. Sibirica, var. D, from native specimens, I will therefore 
place it provisionally amongst the non-dimorphie species. 
Sixth.— Primula verticillata is the last species which I have to 
notice as presenting the non-dimorphie structure. In wild and 
cultivated specimens I find exactly similar relations between 
the anthers and stigmas—the former attached to the upper third 
of the corolla-tube, and included, usually closely appressed to 
the stigma. I may state, however, that the length of the style 
is slightly variable (an occurrence which gives it a theoretical 
interest from its intimate affinity with the P. floribunda already 
noticed as a “dimorphic” species occasionally presenting indi- 
viduals with a non-dimorphic structure); and though, as I have 
just stated, the stigma usually stands at an equal height with 
the anthers, it occasionally rises above them, or even becomes 
slightly exserted beyond the mouth of the corolla-tube. 
These five species, then, with the variety of Primula Sibirica ?, 
