The breathing through the valves for the space of five minutes 
previous to the estimation, served fo prevent a somewhat irregular 
respiration that might possibly arise in the transition from free 
breathing to respiring through the valves. In the interval the tempe- 
rature in the gasometer attained its new equilibrium. 
Throughout the whole experiment an assistant had to watch the 
springbalance, which was to point to the same mark. In case of a 
deviation, the band was at once slackened or tightened during the 
pedalling, which did not cause any disturbance. 
The work done was calculated by multiplying the circumference 
of the disk, i.e. the distance covered after one rotation, by the weight 
indicated on the springbalance. by the number of rotations per time- 
unit and by a correcting factor‘). This showed an amount of labour 
of 22800 K.G.M. per hour. 
The exertion required for the work, was not such as to exhaust 
the subjects. Still, at the finish of the experiment they felt tired as 
if they had been eycling a long distance. 
Our results are the following: 
sitting quietly (a): 
EVH enal CAB): 
Aveiages of all the experiments (12) made in March, April, May, June, July 1912, 
lowest temperature 12°, highest temperature 30°: 
CO, per min. On CO, 
0, 
\ min. 299 max. 386,8 
reele 330,4 0.850 
\ 1001,5 0,8671 
bj 868% min. 781,2 max. 1448 
The average of 8 experiments below 211°: 
CO, Oz CO; 
Oz 
( min. 299 max. 358,8 
Ea 323,5 0,8448 
\ 863,4 0,8643 
ae min. 181,2 max. 988,5 
The average of 4 experiments above 211,9: 
CO, Og CO, 
Oz 
\ min. 322.1 max. 386.8 
LEA 344,5 0,8589 
\ 12T 1 0,8712 
jo min. 1052 max. 1448 
Increase set in after 11—6—’12 (above 211/,°). 
') The correcting factor is the quotient of the lever on which the wire of the 
springbalance is fixed and the radius of the disk. 
