the Alburnum of Trees , 321 
ing with the ascending current in the alburnum : every ex- 
periment that I have made has, on the contrary, tended to 
confirm my former conclusions. 
I am, 
My dear Sir, 
Your much obliged, obedient Servant, 
THOMAS ANDREW KNIGHT. 
Elion , June 15, 1808. 
MDCCCVlir. 
Tt 
