PHYSIOLOGY. 311 
the oily liquid, and secondly an internal very fine 
membrane ‘The internal surface is lined with very 
tender, elastic, cellular texture, which contains the 
oily fluid itself. Hedwig, however, aiter his latest 
researches, does not agree with Koelreuter. ‘This 
great philosopher tells us, that each globule of the 
pollen consists of one vascular membrane only, filled 
in its mterior with a gelatinous fluid, but has no 
cellular texture whatever. And, according to him, 
the pollen emits this fluid at once; it does not, as 
Koelreuter believed, ooze out through pores. Hed- 
wig examined that portion of pollen, which had at 
the female stigma performed its functions, and he 
found his prior observation confirmed. Even the 
stamens of the mosses are, according to him, only 
globules of pollen acting as the others. Hedwig 
finds a great similarity between the pollen and the 
semen of animals, only, that as well as in the animal 
kingdom, it diifers in consistence in different species. 
All observations indeed coincide in this, that the 
fluid which is contained in the pollen, is but a mere 
gelatinous fluid, which, however, cannot easily be 
mixed with water. This however is likewise proved 
by experience, that, though not an oil itself, it con- 
tains a considerable quantity of oil, for an oil may 
be obtained from it by pressure ; it takes fire when 
thrown into a flame, and finally, bees prepare their 
wax from it. It does not however follow, that the 
whole is oily, for an almond cannot be called merely 
an oily substance because oil may be obtained from 
it, it contains this oil in a gelatinous mass. 
U4 - A more 
