124 THEORY OF FEEDING. 



are of suitable composition ; although a combination made 

 from them might give the desired result. For instance, we 

 might wish (as I have done, when stationed in Eastern 

 Assam) to combine unhusked rice (paddy) and gram, so that 

 the mixture might contain the same percentage of nitrogenous 

 matter as oats, which we may accept as the best grain for all 

 ordinary requirements. To do this, we can look up the 

 table of analyses on pages 62 and 63, and will then find the 

 following figures. 



Percentage of nitrogenous matter in paddy = 6.2 

 gram = 19.5 



oats =11. 3 



Let x = percentage of paddy in mixture, 

 andioo-x= ,, gram ,, ,, 



6.3 x 19.5 (loo-x) 



Then, 1 =11.3 



100 100 



x = 62 (about). 



Therefore the required mixture should contain about 62 

 per cent, of paddy, and 38 per cent, of gram. 



Again, suppose we wanted from maize and beans to get a 

 mixture having 12 per cent, of nitrogenous matter, we might 

 proceed as follows : 



Percentage of nitrogenous matter in maize = 10.3 

 ,, ,, ,, beans = 25.4 



Let x = percentage of maize in the mixture. 

 I0.3X 25.4 (ico-x) 

 + -= 12 



100 100 



x 88.7 



Therefore the mixture would contain I part of beans to 

 about 8 parts of maize. 



For reasons already stated (p. 68), these calculations are 

 only approximately correct ; although their limits of error are 

 not sufficiently great to materially affect practical results. 



Maize and linseed will be the most suitable constituents for 

 increasing the respective proportions of starch and fat in a 



