268 REPORTS ON THE STATE OF SCIENCE, ETC. 
provides additional criteria for judging the accurdcy of these complicated measure- 
ments. The graph drawn from the experimental results of these three individuals, 
McHugh, Harrison, and Wilson, represents the metabolic expenditure at the quick 
rate of movement only, where the figures are well separated one from another. At 
the slower rates they fall so closely together as to render charting difficult. 
Considering these three sets of results only, it is evident that the cost of movement 
is greater with the increased body-weight of the subject, and that efficiency is less with 
the subject of smaller weight.! The cost of movement is shown by the distance along 
the abscissa from the zero to the point where it is cut by the particular line, the 
efficiency by the slope of the lines. 
To obtain further information on the factor related to movement experiments were 
performed on the cycle now fitted with a crank, the length of which could be varied 
Cuart II. 
at 
SS ——— 
HARRISON 
3/8/25 
Cc 
B 
IN 
@ 
iin 
Hf 
3 
LENGTH OF CRANK 
© 
: SOD A a 
; il 
o 
\ | 
Be ites 
0) 5° 1-0 5 2:0 
METABOLISM 'N KALS. p.m. 
4 
at will. The lengths employed were 20°32, 17°78, and 15-24 cms., and the rate selected 
was 62:5 revolutions a minute. 
The plotted results of these experiments are such as to indicate that the efficiency 
as shown by the slope of the lines is not very greatly affected, if at all, but the cost of 
movement is considerably greater the greater the length of the crank and the greater 
therefore the degree of angular movement. 
The nature of this modification in the cost of movement is well shown in the 
results of those experiments in which with different lengths of crank no work was done 
on the brake. Further holes were bored in the crank so as to permit measurements 
1T. S. Macdonald, Proc. Roy. Soc., B. 89, 403, 1916. 
