F. E. Nipher— Variation in the Strength of a Muscle. 328 
off on the axis of abscissa. The values of (s) determined on 
the same day are represented by the small circles which lie in 
the same vertical. 
a height of 0-7 meters in 1:25 seconds. The manner of experi- 
ment has already been described in former papers. e re- 
sults of these experiments are shown on the chart. The broken 
line A B is the series of constant experiments given in the first 
table, on page 188 of this Journal, for Feb., 1875. The dates 
of the individual experiments are not known, but no two ex- 
periments were separated from each other by an interval of 
more than two days. Soon after this series was finished, the 
e third series was made with a view of finding the rela- 
i ta 
Zontal arm, the position of the arm being the same as befo 
The time (¢) of exhaustion from day to day (in seconds) is shown 
kK the former being my own 
ers. 
. Vuring the time of these experiments the muscles were kept 
in gentle training by daily exercises on the swinging rin and 
Nel bars. Th 
Avr 
Je 
* Ths, ‘ 
This Journal, Feh., 1975, pp. 129-187. Natare vel. xi, p. - 
f The tiwe of the sunmer vacation excepted. 
