2 18 
same principles as in the buds ; and in addition, a 
peculiar green resinous matter. The petals of the 
flower yielded a yellowish resin, saccharine matter, 
albuminous matter, and a little wax : the stamina 
afforded sugar, resin, and tannin. 
The young chesnuts examined immediately after 
their formation afforded a large quantity of a matter 
which appeared to be a combination of albuminous 
matter and tannin. All the parts of the plant 
afforded saline combinations of the acetic and 
phosphoric acids. 
M. Vauquelin could not obtain a sufficient 
quantity of the sap of the horse-chesnut for ex- 
amination ; a circumstance much to be regretted ; 
and he has not stated the relative quantities of the 
different substances in the buds, leaves, flowers, 
and seeds. It is probable, however, from his un- 
finished details, that the quantity of resinous mat- 
ter is increased in the leaf, and that the white 
fibrous pulp of the chesnut is formed by the mutual 
action of albuminous and astringent matter, which 
probably are supplied by different cells or vessels. 
I have already mentioned # that the cambium, 
from which the new parts in the trunk and branches 
appear to be formed, probably owes its power of 
consolidation to the mixture of two different kinds 
of sap ; one of which flows upwards from the roots ; 
and the other of which probably descends from 
the leaves. I attempted, in May 1804, at the 
time the cambium was forming in the oak, to as- 
certain the nature of the action of the sap of the 
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