674 PHYSIOLOGY OF THE DOMESTIC ANIMALS. 



mate of the excretion of C0 2 by means of Pettenkofer's apparatus and 

 carburetted hydrogen of the intestinal canal, the following data were 

 obtained : — 



A. Daily Income. 





Water. 



Mineral 

 Matter. 



C. 



H. 



N. 



O. 



70.975 kilos food, 



. 58.200 



0.890 



5.825 



7.500 



0.310 



4.900 





B 



. Daily Outgo. 











Water. 



Mineral 

 Matter. 



C. 



H. 



N. 



O. 



40.65 kilos feces, 

 13.9 kilos urine, 

 9.795 kilos C0 2 , 

 0.03 kilo CH 2 , 



. 35.075 

 . 13.075 



0.575 

 0.305 



2.585 

 0.22 

 2.67 

 0.02 " 



0.310 

 0.025 



o.oi ' 



0.105 

 0.170 



2.00 

 0.105 



Total, . . 48.150 0.880 5.495 0.345 0.275 0.230 



In addition to the above, 9.5025 kilos water in the form of aqueous 

 vapor were removed through the lungs and skin. 



The total of amounts daily appropriated and kept in the body, con- 

 sequently, were : — 



Wt» &! C. H. N. O. 



0.525 0.010 0.330 0.050 0.035 0.850 



These figures corresponded to a daily increase of — 



Albumen, 0.220 kilo. 



Eat 0.280 " 



Salts, 0.010 " 



Water, 0.525 " 



The calculation of the statistics of nitrogen in milk- and wool-pro- 

 ducing animals is somewhat more complicated than the above, as the 

 amount of the above productions have also to be taken into account. 



1. Tissue Changes in Starvation.— Before attempting to study in 

 detail the influence of food on tissue change, the changes which occur in 

 the animal body when all food is withheld must first be studied. And 

 here it should, in the first place, be recollected that the skeletal muscles 

 form nearly one-half the body, and about one-quarter of all the blood in 

 the body is contained within them, while another fourth of the blood is 

 contained in the liver. These two facts are sufficient to indicate that a 

 large part of the metabolism of the body is carried on in the muscles 

 and liver. 



In fasting animals there is a steady waste of the various tissues and 

 an excretion of those waste products ; and since this waste is not sup- 

 plied by new matter, there is a progressive loss of body weight. 



