282 Scientific Intelligence. 
shown by the plants left to themselves, and but sparingly sew met insects, 
in the flower-garden in 1861, and likewise by those raised in 
Next, with the view of ascertaining the immediate cause of ree almost 
absolate sterility of long-styled pistils | with their own form of pollen, 
stigmas wi © freely penetrated by numerous pollen-tubes. But when 
Weatibmnorphic unions were attempted, no pollen-tubes, or scarcely any, 
were emitted ; even after an interval of three days thé stigmas remained 
straight and fresh- colored, and the pollen inactive. When two or three 
a see stigmas were dusted with their own form of pollen, and the others 
h the opposite form, the difference was striking ; the former stigmas 
Selene straight, fresh, and unpenetrated or nearly so, while the latter 
soon discolored, twisted, half-shrivelled, and penetrated by a multi- 
tude of "pollen-tubes. 
ently simpy due to the Doane of the stigma. Yet we viainly see that 
two pollens and the two stigmas are widely dissimilar in action, i 
of rn ach aie being . oo powerless on their own pollen, but shear beak 
_ The results are nearly the same in LZ. perenne, except that pollen-tubes 
= found to be produced in attempted i tt unions, xa either 
em 
len, And then the twisting of the long styles in 
tl of the short ones in both species are noteworthy : me 
n speaking of the fertilization of plants or of the production of 
ris, vane refer to the wind or to insects as if the abeeeatren were indif- 
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