130 On the proper Balance of the Food in Nutrition, 



may be given in diverse properly assorted alimentary mixtures, 

 we would refer to the divisions III., IV., V. and VI. of the 

 foregoing table. 



If a cow requires in twenty- four hours 10 kilogrammes 

 (22 05 lbs. avoirdupois) of air-dried hay, how many kilo- 

 grammes of the mixture given above of clover and potatoes 

 would it require to replace it? 



10 kilogrammes of air-dried clover contain in all S'O'i kilo- 

 grammes (17*728 lbs. avoirdupois) of nutritious matter, for 

 12-47 : 10-03=10 : .r 

 .r=8-04. 

 That mixture will consist of 9' 7 kilogrammes (21*38 lbs. avoir- 

 dupois) of dry clover, which contain in all 7'68 kilogrammes 

 (16-93 lbs.) of nutritious matter and 123*6 kilogrammes (272*5 

 lbs.) of potatoes, which contain in all 31*20 kilogrammes 

 (68*79 lbs.) of nutritious matter. 



133*3 kilogrammes (293*93 lbs.) of the mixture contain ac- 

 cordingly S8*88 kilogrammes (85*72 lbs.) of nutritious matter. 



38*88 kilogrammes (85*72 lbs.) of the joint nutritious mat- 

 ters are equal to 133*3 kilogrammes (293*93 lbs.) of the mix- 

 ture. How many are SO* equal to? x = 27'5 (6063 lbs.). 



27*5 kilogrammes (6063 lbs.) of the mixture in question 

 are equivalent to 10 kilogrammes (22*05 lbs.) of hay in the 

 proportion and quantity of nitrogenous and non-nitrogenous 

 alimentary substances. In a precisely similar manner the 

 kind and quantity of the salts must be attended to in practice. 



Conclusions from the foregoing. 



We have approximated much more closely to the object 

 we had in view, viz. a completely rational system of nutrition, 

 than it has hitherto been possible to do, and can answer the 

 proposed questions with perfectly accurate average numbers ; 

 and we have now only duly to consider the influence which 

 the unappropriated portions of food exert on the body (the 

 getting rid of them involves a waste of strength) ; and further, 

 the greater or less degree of digestibility {der leichteren oder 

 schwerereji, schnelleren oderlafigsameren Verdaidichkeit) of each 

 species of aliment, in order to do it with perfect precision. 



But we can even now, from what has already been stated, 

 educe safe and weighty conclusions, namely the following: — 



1. It is an impossibility to sustain either a mart or a beast 

 on food entirely devoid of nitrogen, however great in quantity 

 it may be. 



2. All that has been said in the older as well as in many of 

 the newer books on husbandry, respecting the relative nutri- 

 tive value of different kinds of forage, cannot, inasnTUch as it 



