PLATE XI. 
alluded to, shows us, by the following comparison, how Pin-eyed plants 
bear less seed than the Thrum-eyed :—“ The long-styled plants have a 
much longer pistil, with a globular and rougher stigma standing high 
above the anthers. Stamens short, grains of pollen smaller, oblong in 
shape ; upper half of the tube of the corolla more expanded ; number 
of seeds produced is smaller.” “The short-styled plants have a short 
pistil, half the length of the tube of the corolla, with smooth depressed 
stigma beneath the anthers. Stamens long, grains of pollen spherical 
and larger. Tube of the corolla of the same diameter till close to its 
upper end.” In summing up his observations he tells us that in the 
case of Primula veris, auricula and sinensis, all of which are dimorphic, 
the pollen of the opposite form in each of these plants is most essential _ 
for their perfect fertilization ; and that this reciprocal benefit conferred, 
doubtless favours the intercrossing of species at the same time. He 
makes mention of some dimorphic Primulas, and casually refers to P. 
Marginata as probably in that condition. I have to regret that I had 
no knowledge of the above facts when I made my drawings, and the 
dissections which I have given, though generally trustworthy, are not 
as detailed as I could wish. In Part II. of this work, I have a third 
Primula to figure (P. Allionii), when I shall hope to add some notice of 
such facts as I have been able to gather on all three species. P. Mar- 
ginata grows near Mentone on the higher mountains, at an elevation of 
from 3,400 to 4,000 feet. The specimens figured were gathered April 
15th. 
