136 
Deyeux in the sap of the vine and the yoke elm 
has detected a matter analogous to the curd of 
milk. I found a substance similar to albumen in 
the sap of the walnut tree. 
I found the juice which exudes from the vessels 
of the marshmallow when cut, to be a solution of 
mucilage. 
The fluids contained in the sap vessels of wheat 
and barley, afforded in some experiments which I 
made on them, mucilage, sugar, and a matter which 
coagulated by heat ; which last was most abundant 
in wheat. 
The following table contains a statement of the 
quantity of soluble or nutritive matters existing 
in varieties of the different substances that have 
been mentioned, and of some others which are 
used as articles of food, either for man or cattle. 
The analyses are my own ; and were conducted 
with a view to a knowledge of the general nature 
and quantity of the products, and not of their 
intimate chemical composition. The soluble mat- 
ters afforded by the grasses, except that from the 
florin in winter, were obtained by Mr. Sinclair, 
gardener to the Duke of Bedford, from given 
weights of the grasses cut when the seeds were 
lipe; they were sent to me by his Grace’s desire 
for chemical examination, and form part of the 
results of an important and extensive series of ex- 
periments on grasses, made by direction of the 
Duke, at Woburn Abbey, when pursuing those 
plans for the improvement of agriculture, the origin 
of which have thrown so much glory on the memory 
of his illustrious brother. 
