A HARD-WORKING DIET. 113 
Brienz, yet there is an hotel on its summit. Besides, 
it can be ascended by a very steep path, which was, 
of course, favourable for our experiment, because the 
amount of muscular action which is lost and not 
calculable (being reconverted into heat) is thus 
reduced to a minimum. We chose the steepest of 
the practicable paths. . . . [The details of the experi- 
ment are then given. | 
In order to diminish as far as possible the unne- 
cessary consumption (Larus consumtion) of albumen 
during the experiment, they took no albuminoid food 
from midday on August 29 until 7 o’clock in the 
evening of August 30... . 
The experiment proper began on the evening of the 
20th of August at 6 P.M. and ended at 6 A.M. August 
31st. The composition of the products of the body 
leaving through the kidneys during that time was sub- 
sequently strictly analysed, and the results obtained, 
too long to give here, furnished a new testimony to 
the fact, which has often before been experimentally 
proved, that muscular exertion does NOT notably in- 
crease the quantity of nitrogen in such products. 
Note to p. 22. 
In the case of the Great Western Railway referred 
to, p. 22, when in 1872 500 miles of rails were 
shifted within a fortnight, the extra nitrogen, together 
with extra carbon supplied, was in the form of oat- 
meal. The men carried their own bacon, bread, 
cheese, cocoa, &c., as usual; but a pound-and-a-half 
of oatmeal (see the value of oatmeal on p. 30), and 
half-a-pound of sugar was allowed daily to each man, 
and for each gang of twenty-one men a cook was 
