t '57 ] 



P. S. You will find by the date of my letter, 

 that I have kept it feme time fince it was written. 

 The delay, however, has enabled me to fet right 

 one fad: contained in it. I was laft week, at 

 Houghton, and wifhing to fee that my relation 

 was true in every particular, on queftioning the 

 fteward, I found to my mortification that in fome 

 of the woods above-mentioned there was a diffe- 

 rence of ten or fifteen years in the growth of the 

 trees from which the planks were cut. Though 

 for the fake of truth 1 was glad to make this dif. 

 covery, yet I am forry to find that it leifens in fome 

 degree the value of the experiment. 



[N. B. We hope the preceding letter from Sir Tho. BeevOr 

 will excite other gentlemen to make fimilar experiments, the event 

 of which may prove of public utility.] 



Article XXIII. 



A Philofophical Enquiry concerning the Principles of 

 Vegetation, with a view to a/certain the moft certain 

 means of promoting its Improvement and Extenfion. 



[By Mr. Joseph Wimpev, of North-Bockhampton.] 

 Gentlemen, 



THE fubjed of this enquiry has been an objed 

 of purfuit in every age, and of every civi- 

 lized country in the world ; not uniformly, and unin- 

 terruptedly. 



