172 Professor Whewell on the 



The amount of capital and labour which will be employed on 

 an acre of the new soil will depend upon its agricultural consti- 

 tution. The farmer will fix upon such quantities as give him the 

 most profitable returns. 



In the case supposed by Mr. Ricardo, p. 115, 1 = 1, c' = c. Hence 

 the last formulae apply; and we have for the portions of the 

 value of the produce 



the whole produce is, in the first case, in money pr or nlw, and 



in corn r: in the second case it is in money p'r or (l + x)nlw, 



and in corn r, as before. 



„. , , , {pr-lw')l' . ., , pr-lw 



We had y' = - r ^ : similarly 7 ='— - — ; 



therefore 



y pr — lw cl' _ n — \—fx cl' 



7 pr-lw'c'l » — 1 c'l' 



In the case taken by Mr. Ricardo, as before, cl'=c'l. Also 



7 = ,16; n = 3;fx = —> 



19 

 therefore 7 = qq x ,16 = , 152. 



From these formulae we may obtain the numerical results 



which Mr. Ricardo has given at p. 115. (See also pp. 75, 98, &c). 



He supposes r to be 180 and r' to be successively 170, 160, 150, 



140 ; f is - . Also, in the examples given, n = 3. If we make, 



17 2 



for instance, r'=150, we have 



180 1 /, , 1 \ 



