REPRODUCTIVE ORGANS IN THE PRIMULACER. 109 
Number of Length of stamens, _ Length of pistils, 
flowers. in lines, in lines. 
4. 
The numbers attached to the sketches correspond with those in 
the table of measurements. In the first case (No.1) the structure 
is normally short-styled—stamens reaching the mouth of the 
corolla, pollen-grains large. In the second case (No. 3) the 
length of the stamens and pistils is nearly equal, and in this 
respect present the normal non-dimorphic characteristics of the 
plant, differing from it, however, in both (organs) being shorter 
than the tube of the corolla, and likewise in the greater variability 
of the size of the pollen-grains, which, upon the whole, are smaller 
than those produced by normally structured flowers. Again, in 
No. 4 we have an approximation to the long-styled structure— 
the stamens attached somewhat above the middle of the corolla- 
tube, while the stigma slightly projects from its mouth. The pollen- 
grains of this flower were plainly smaller than those from any of the 
other flowers, though undoubtedly more variable in size than those 
characteristic of the normal long-styled form. 
In respect to the functional results of these flowers by fertili- 
zation with own pollen I cannot as yet speak, the capsules not 
being sufficiently matured. Nevertheless I think it will be 
admitted by all who believe in the gradual modification of organic 
beings, that, irrespective of any knowledge as to the subsistence of 
diverse functional correlations between the sexual elements of the 
individual flowers, the mere structural differences suffice to show 
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