PRODUCTION OF HEAT. 41 



This Table represents the exchange for a twenty-four hours' period, com- 

 mencing twenty-four hours after the last meal, and relating to the same person 

 as Table I. The discharge of N per kilo, of body-weight was reduced to 

 O'l, being 23-5. In the carnivorous animal, in prolonged inanition, the 

 discharge of N per kilo, is 0*9 per diem per kilo, and ^ = 6 "6. 



In fever the exchange of material resembles that of 

 inanition, but the disintegration of proteid is more rapid. 



TABLE IV.* 



Exchange of Material in Fever. 

 DISINTEGRATION OF TISSUE. 



Nitrogen. Carbon. 



Albumin . . 120 grammes 18 '6 grammes 63*6 grammes 

 Fat . . . 2057 157-4 



221'0 



DISCHARGE OF NITROGEN AND CARBON. 



Urea and Uric Acid 40 grammes 18*6 grammes 8*3 grammes 

 Respiration (CO 2 ) 780 ,, 212-7 ,, 



221'0 



PRODUCTION OF HEAT. 



Animal heat, like mechanical work, is a result of the 

 chemical process of the conversion of food into water, 

 CO 2 , urea, and other excreted products. 



An approach to an experimental proof of this is obtained 

 by comparing the quantity of heat produced by a man or 

 an animal in a given time, with the quantity and physio- 

 logical "heat-value" of the different kinds of food con- 

 sumed during the same period. 



Of these investigations the first is accomplished calori- 

 metrically ; the second by determining the quantity of 



* The data for this Table are to be found in a paper in the Practitioner 

 for April, May, and June, 1876. 



