200 Mr H. F. Baxter on Muscular Power. 
There are other precautions necessary to be observed, 
which will be better understood after detailing some of the 
experiments. 
It would have been far more satisfactory to have de- 
tailed the observations made upon each individual frog ; but 
as this would occupy too much space, including sixty expe- 
riments, I have thought it better to tabulate the results and 
give the particulars of one experiment, and describe the 
mode of proceeding in each. 
The weight (Troy weight) was first ascertained, and the 
frog then arranged for the experiments. The index having 
been pushed back as far as it could be, the degree at which 
it stood was noted ; a weight was then put into the scale, 
and the index then carried back and the degree noted—this 
gave the elongation produced by the weight. The muscle 
was then made to contract, the degree noted, and the index 
pushed back; the muscle was again made to contract, the 
degree noted, and the index pushed back; this was done 
three times consecutively: the weight removed, and the 
degree to which the index returned noted. Half a minute 
was allowed to elapse; the electrode was cleaned and 
scraped, and another weight was then added to the scale, 
when similar observations were made. I could make the 
three observations, and record them, in twelve seconds ; 
but with an assistant to record them it took about five 
seconds. ‘To render the description clearer, I will give the 
details of one experiment. 
July 14. Weight of frog 3 drs. Struggles of the animal carried 
54 grs., caught yesterday after- | the scale without the weight to 85°. 
noon. 
Index 52. Index 44. 
4 oz. 39 40 5 0%. 34 349 
39 40 34 343 
383 39} 335 34} 
Index 45, Index 41}. 
6 02. 35 353 | 4 02 35 = 386 
343 35 oo. Ob 
34 ©6344 O53: ~2p6 
Index 48. Index 41. 
36037 35 36 
36 «= 337 ! 35 36 
