[ 58 J 



Were I the inventor of any machine or imple- 

 ment in hufbandry, which I had reafon to think 

 would be acceptable to the publick, I would fet it 

 at a price fo moderate as could be no impediment 

 to the fale of it. It may be a queftion, what would 

 in this cafe be a moderate profit ? The profits in 

 trade, when the returns are not very large, we may 

 fuppofe to run from lo to 15 percent. But in this 

 cafe, where ingenuity is as necelTary as diligence, 

 we will fuppofe twice that fum, or fay from 20 to 

 30 per cent, would not be generally thought immo- 

 derate. On thefe terms, therefore, I fliould hope, 

 every one who had beflowed his time and pains 

 with a view to ferve the publick, would, in the large 

 demands he might have for his inftruments, find a 

 full and fatisfa6lory recompence for his ingenuity, ex- 

 pence, and trouble, efpecially if, in the conftru6tion, 

 his principal object was ceconomy, as far as could be 

 made to confift with convenience and utility. 



Had I the pleafure of Mr. Barnes's acquaint- 

 ance, I would beg leave to recommend thefe obfer- 

 vations to his confideration, being fully perfuaded, 

 he would find the demand for his machine in pro- 

 portion to the price; the lower in reafon he makes 

 it to the publick, the higher his intereft would rife 

 in proportion thereto, I am of opinion, where a 



maa 



