506 PHYSIOLOGY AT THE FARM. 



requires to be repeated to keep up the temperature at 100 Fah- 

 renheit twenty-four times in the 24 hours. Prom this, by the 

 rule of three, we come easily at the amount of carbon required 

 in the human body for a like effect. Suppose the weight of a 

 man's body is 150 lb., then the number of ounces is 2400, or 100 

 less than in 2 J cubic feet of water and his temperature falls at 

 the rate of 1 Fahrenheit for his whole mass every hour, then, as 

 14,200 : 2400 : : 24 : 4.05, the last number being the quantity 

 of carbon required for such an effect in the human body. This 

 is indeed a large quantity of carbon to be required under so 

 low an estimate of the heat lost in 24 hours. But it belongs 

 to the advocates for the doctrine of the " conservation of energy" 

 to settle a point so important to the establishment of their 

 views. The non-conducting property of the dress in man, and 

 of the coats of animals, and also of the internal solids, is to 

 be taken into account in any nice calculation under this head. 



Application of foregoing views to the choice of food for the 

 Horse. In the mean time, however, taking it for granted that 

 they can settle this point satisfactorily, we proceed to consider 

 the division of the total carbonic acid produced by an adult 

 animal in 24 hours into the portions respectively belonging to 

 vital force, heat force, and mechanical force ; and the applica- 

 tion of that division, always with reference to the same doctrine 

 of the "conservation of energy," to the determination of the pro- 

 portion between the non-nitrogenous food and the nitrogenous 

 food that may be considered compatible with the good condi- 

 tion of animals under the several different circumstances of 

 their existence. 



When a living body remains stationary in point of weight, 

 the quantity of carbon consumed daily in the production of 

 carbonic acid must be equal to the carbon contained in the 

 food that is, in the daily sum of flesh-formers and heat-givers. 

 The carbon available for the support of the standard animal 



