the true Sap of Trees is deposited during Winter. 103 
but as the subject of the Paper, which I have now the honour 
to address to you, appeared to be of more importance, I have 
deferred those observations to a future opportunity ; and I shall 
at present only observe, that I conceive my self to be in possession 
of facts to prove that both buds and roots originate from the 
alburnous substance of plants, and not, as is, I believe, generally 
supposed, from the bark. 
Elton, Dec. 4, 
1804. 
I am, &c. 
T. ANDREW KNIGHT. 
