500 PRINCIPLES OF ANIMAL NUTRITION. 
If from the totals given in the table we subtract the figures 
for rest, we have the following as the increments of the respiration 
due.to the work, including the work of standing: 
* 
| | Oxygen, Carbon Dioxide, 
cc. 
Ascending slight incline. . 551.0 400.5 
steeper “‘ 1111.0 865.9 
The weight of the animal and the distance traversed having 
differed somewhat, the results may be rendered comparable by com- 
puting them per kilogram of weight and per meter of distance trav- 
ersed—that is, by dividing in each case by the product of weight 
into distance. Expressing the results in gram-meters and cubic 
millimeters for convenience we have— 
Oxygen Carbon Dioxide | Work of Ascent, 
c.mm, cmm. gr.-m. 
Ascending slight incline.. 260.40 189.27 6.252 
steeper “ .... 523 .93 408 .35 172.512 
If we let x equal the oxygen consumption required for the trans- 
portation of 1 kg. through 1 meter and y that required per gram- 
meter of work of ascent we have 
z+ 6.252y=260.40 c.mm. 
x+172.512y= 523.93 c.mm. 
whence we have 
z=250.49 e.mm. 
y= 1.585 ¢.mm. 
A similar computation for the carbon dioxide gives 
Locomotion, per kg. and meter....... 181.033 e.mm. 
Per gram-meter of work of ascent. . 1.317 c.mm. 
and the corresponding respiratory quotient is 0.723. 
With these data in hand it is easy to compute the increased 
respiratory exchange corresponding to one gram-meter of work of 
draft as follows: 
