216 PRINCIPLES OF ANIMAL NUTRITION. 
all cases the animal was liberally fed, usually with oats, hay, and 
cut straw. 
VARIATION DURING Work.—In their experiments cited above, 
Chauveau & Laulanié find that the rise of the respiratory quotient 
which they regard as the invariable result of muscular exertion 
occurs promptly upon the beginning of the work, and the same thing 
is shown by the earlier results of Chauveau. As the work is con- 
tinued, however, the quotient shows a tendency to fall again, some- 
time even going below its original rest value, while in a period of 
rest following work a still further decrease is observed. The 
results of their experiments * are contained in the table on the 
opposite page. 
Zuntz & Hagemann f also report a number of experiments on 
the horse in which the respiratory exchange was determined in suc- 
cessive periods of work. The following are their results for the 
respiratory quotient: 
Successive Values of Respiratory Quotient. Aggregate Length 
Bepaleeny = Wa pene 
1 2 3 ; 
BF 62% wusees we .917 865 slew 80 
O82 seal yg a si .913 -806 ates 1213 
4) eo xas oa HEE .929 .889 etelee 102 
ADs Ghana eae Beis -925 948 .897 100 
Ss .920 -931 875 924 
BO a acsue d.aavaye a 865 868 911 54 
IG ee cititd Sa hcg -928 -921 sakes 34 
ee eee .910 926 avers 48 
OBE clenien Sa Ret 974 -905 - 837 65 
OB sigs Sone 863 .820 sitar 73 
O68 estes saw seas 911 922 saieie 71 
OF is sees ‘esis 949 934 871 124 
18s cme ns i wes 936 909 878 78 
96% smacines daw -931 -904 883 75 
The results cited in the foregoing paragraphs would appear to 
justify the general conclusion that in the case of fasting animals or 
* Comptes rend., 122, 1244, 
¢ Loc. cit., pp. 290-292. 
