508 PRINCIPLES OF ANIMAL NUTRITION. 
On the average, an increase of 1 meter per minute in the speed 
was found to cause an increased metabolism corresponding to— 
ORYVEON: 23 cco dee we ewa es Selene 0.692 c.mm. 
Hire yin wien stew ee kee eS 0.00345 cal. 
A similar computation for the experiments on ascending a con- 
siderable grade without load or draft showed a similar difference, 
which, however, seemed to be chiefly or entirely due to variations 
in the work of locomotion. When the amount of the latter was 
‘computed with the correction for speed just given, the metabolism 
due to the actual work of ascent seemed to be independent of the 
speed, the only exception being two experiments at a rapid walk in 
which over exertion of the animal was suspected. 
In the thirteen experiments on the work of ascending a moderate 
grade contained in Table IX, the average speed was 81.95 meters 
per minute, while in the thirty-five experiments with which they 
are compared (Table VIII) the average speed was 90.16 meters. 
From the table on p. 506 we compute that the consumption of 
oxygen (R.Q.=0.86) and the corresponding energy values per kilo- 
gram and meter at these speeds would be— 
| | Oxygen. Energy. | 
¢.mm. cals, 
At 90.16 M. velocity:...... 75.80 0.3746 
“ 81.95 M. SM” seats as 70.05 0.3462 
Substituting this corrected value of x in the equations on 
p- 506, we have as the corrected value of y per kilogram-meter for 
ascending a moderate grade 
6.851 cals. =2.912 kgm. =34.3 per cent. 
In brief, a correction for the value of x is computed. using the 
first value of y, and then this corrected value of x is used to com- 
pute the corrected value of y. In other words, the method is one 
of approximation, but the errors of the corrected values are pre- 
sumably less than the unavoidable errors of experiment. 
Effect of Load—In a number of experiments the horse carried 
on the saddle a load, consisting of lead plates, corresponding to that 
of arider. The mere sustaining of such a weight at rest was found 
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