208 Mr H. F. Baxter on Muscular Power. 
frog, which weighed 7 drs. 10 grs. With a weight of 4 oz., 
after the lapse of five minutes, the muscles were examined. 
The separate muscles indicated the one acted upon 4°, the 
other 2°. When united to show the differential current, 
the effect was 14° in favour of the muscle experimented 
with ; when the elements were arranged to show the com- 
bined current, the effect upon the needle was 5°. 
In other experiments, four in number, the results always 
indicated an increase on the part of the muscle experi- 
mented with. 
Not having the necessary apparatus, I could not investi- 
gate the question respecting the heat that is developed 
during muscular contraction. 
The following conclusions may be deduced from the fore- 
going inquiry :— 
1st, Out of 60 frogs taken indiscriminately, the average 
results of the experiments show that 1 grain of muscle is 
capable of raising a weight of 608 grs. 1°, or through a 
space of sd of an inch. 
2d, That sex has an important influence over the results. 
In males it was found that 1 gr. = 656 grs., whilst in females, 
1 gr. = O79 gers. 
3d, That the weight of the animal previous to the expe- 
riment gave no indication as to the real rasuaom power of 
the animal that could be relied on. 
4th, That during the experiment there was a loss of 
weight in the animal but an increase of weight in the 
muscle experimented upon. 
5th, That an increased nutrition of the muscle was indi- 
cated by its weight, its vascularity, increase in its electrical 
condition, and by the maintenance of its muscular power. 
6th, That circumstances influencing the health of the 
animal, such as absence of food, temperature, and confine- 
ment, have an important influence over the results. 
7th, That the maintenance of the circulation of the blood 
is of the utmost importance in these experiments. 
§ 2. On the Application of the Principle of “ Conservation of Force 
or Energy” to the Explanation of Physiological Phenomena. 
In my concluding remarks, I will make a few observa- — 
