t 31* ) 



Land Revenue Office, April 25, 1789. 



Sir, 



We have received your letter of yefterday's date, which, 

 contains a very clear and fatisfactory anfwer to our enquiries 

 refpeeting the effects of injuries done to the bark of oak-trees, 

 .and the means of preventing damage to -the timber from that 

 caufe ; and the fpecimens fent with your letter afford the 

 moll convincing proofs both of the deftructive confequences 

 arifing from even flight injuries to the bark, when no means 

 are ufed to prevent them, and of the efficacy of your difcovery 

 for preventing and curing defects in timber proceeding from 

 that fource : but we obferve that you have not given an anfwer 

 to our enquiry as to the expence which the application of the 

 remedy you have difcovered would be attended with, by the 

 hundred, or thoufand, or any given number of trees, in cafe 

 there Ihould be occafion to apply it to a very confiderable 

 number : we therefore repeat our requeft, that you will be fo 

 good as to inform us, as nearly as you can, whereabouts 

 would be the expence of fuch application, including labour, 

 materials, and all incidental charges, but exclufive of any 

 reward to yourfelf for difclofing the Compofition for the 

 benefit of the public, which we conceive ihould be given 

 feparately. 



We are, Sir, 

 Your mod obedient Servants, 



JOHN CALL. 

 JOHN FORDYCE. 



Mr. William Forsyth* 



