RESPIRATION. 639 



The heat evolved heated 56 Ibs. avoirdupois of water P.159, 

 or it would have raised the temperature of 1 Ib. of water 64.9. 



The heat evolved by the formation of carbonic acid gas was 

 3.87, and that by the formation of water was 11. 97 ; mak- 

 ing together 51.84, or 13.l less than the heat actually evolved. 



(12.) An adult duck was experimented on in the same way. 

 If we suppose the heat evolved to have been 100; that result- 

 ing from the formation of carbonic acid will be 60.5, and that 

 from the formation of water 19.2; making together 79*7, or 

 20. 3 less than the heat actually evolved. 



(13.) An adult cock was experimented on in the same way. If 

 we suppose the heat evolved to have been 100 ; that evolved by 

 the formation of carbonic acid will be 60.5, and that from the for- 

 mation of water 19.2 ; making together 79, or 20.3 less 

 than the heat actually evolved. 



(14.) An adult Virginian duck was enclosed in the apparatus. 

 The experiment lasted one hour and twenty-five minutes. The 

 volume of air employed was 2937*5 cubic inches, reduced by the 

 breathing of the animal to 2919*3 cubic inches. The loss of 

 volume was 18*2 cubic inches, or about T J T of the original vo- 

 lume. The proportion of azotic gas in the air respired was in- 

 creased by 44*36 cubic inches. 



The oxygen gas consumed was 160*35 cubic inches. The 

 carbonic acid formed was 97*71 cubic inches ; so that 62*54 cu- 

 bic inches of the oxygen must have been consumed in forming 

 water. 



The heat given out heated 56 Ibs. of water 0.99 ; or it would 

 have raised the temperature of 1 Ib. of water 55.44. 



The heat evolved by the formation of the carbonic acid was 

 26.06 ; and that by the formation of water 16.70 ; making to- 

 gether 42. 7 5 ; or 12. 6 9 less than the heat actually evolved. 



(15.) Four owls experimented upon. If the heat given out 

 was 100, that evolved by the formation of the carbonic acid was 

 56.3, and that by the formation of water 18.3, making together 

 74.6 ; or 25.4 less than the heat actually evolved. 



(16.) 'Four magpies fed on animal food were experimented on. 

 If the animal heat given out was 100, that given out by the 

 formation of carbonic acid was 5 7. 6, and that by the formation 

 of water 17.8; making together 75.4, or 24.6 less than the 

 heat actually evolved. 

 If these experiments of Despretz have been accurately performed, 



