218 



NOTICES OF AUTHORS. 



est scrutiny of its utility as applied to her domains, 

 - — she proceeds thus to weigh Mr Withers's prac- 

 tice : — 



Extra Cost per Acre. 



Twenty loads of putrescent manure, at the average price at 

 which thousands of tons are annually imported to the val- 

 ley of the Tay from Englafid, 9s. per load, L, 9 0 0 

 Carriage expenses of above, at 3s. per do. 3 0 0 



Twenty loads calcareous manure, including 

 carriage (were marl not at hand, lime would 

 cost thrice as much), . , . 4 0 0 



Trenching, . • . . 9 0 0 



Total first extra cost, , . L.25 0 0 



Accumulation by 28 years' interest, at 5 per 



cent, nearly, .... L.lOO 0 0 



Wotdd land under timber 2S years planted, 

 with growth accelerated by Mr Withers's practice, 

 in two-thirds of the available -g¥o«ftd- of Scotland, 

 sell at more than L. 100 per English acre ? Sup- 

 pose that the thinnings previous to the 28th year 

 would cover the cost of planting, and subsequent 

 cultivation and attention which is necessary, besides 



