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In this experiment at the end of eight minutes of contractions a rise of 0.0208° C. had occurred. During the five minutes of repose following, the temperature fell back to the starting point, and stood there at the close of the experiment.

3rd Experiment. 1° deflection of galvanometer is equal to 0.004166°C. At the end of 0 minutes

0°....

0° Commenced contractions. 1, 2, 3, 4, 5, 6 minutes 7 minutes

+ 6o..

+0.025°C.

Stopped contractions. 8, 9, 10, 11, 12 minutes

...............

.....

0°...............

In this experiment at the end of seven minutes' muscular action, the temperature stood at 0·025° C. above the starting point. Subsequently a fall to zero ensued, and this latter temperature was preserved during five minutes of repose.

4th Experiment. 1° deflection of galvanometer is equal to 0.004166°C. At the end of 0 minutes

0°......

Commenced contractions. 1, 2, 3, 4, 5, 6, 7 minutes

Stopped contractions. 8, 9, 10, 11, 12

No change of temperature either during or after the contractions.

5th, 6th, 7th, 8th, 9th, 10th, 11th, 12th, 13th, 14th, 15th, and 16th Experiments were made under the same conditions as 4th Experiment, and furnished the same negative results as the latter.

Our sixteen experiments may be grouped as follows:

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Dr. Amidon has tabulated the results of sixty-two experiments on this muscle.* From them we obtain the following values :

Number of Per

centages. Rise of temperature......... 40 64.5161 Average rise, 0.2868°C. Fall

4

6:4517 Maximum , 1.25°C. Temperature unchanged...... 18 29.0322

Minimum ,

0.0555°C.

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Experiments on the contraction of the trapezius and the levator

anguli scapule. The thermo-pile was placed at a point distant from the root of the nose, on the median line, 120 mm. to 130 mm., and distant laterally from the same line 20 mm. to 40 mm. The pile was on the left side of the head, and the muscles of the right side were contracted.

1st Experiment.
1° deflection of galvanometer is equal to 0·004237°C.

Rise or fall of temperature.
Time from
commencement Deflections of Thermometric
of contractions. galvanometer. values.

Comments.

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We have here, during seven minutes of contractions (with the exception of a temporary rise of 0.0084° C. in the sixth minute), a temperature continuously at or below the starting point, the maximum fall being 0.0466° C. During four minutes of inactivity immediately following the contractions the temperature fluctuated between 0·0254° C. below, and 0.0169° C. above, the starting point. When the experiment closed-at the end of the twelfth minute from the commencement--the temperature was 0.00423° C. below

the zero.

2nd Experiment.

0 minutes .......

+5° ... +1°..

1° deflection of galvanometer is equal to 0.004237°C. At the end of

0°........... 0° Commenced contractions. 2

-10°

-0.0423°C. 3

+0.0211°C. 4

+0.00423°C. 45

+0:0423°C. 5

+0.0084°C. -5°

-0.0211°C. 7

-2°.

-0.0084°C.

Stopped contractions. +2°. .......... + 0.0084°C. 10

-3°

-0.0127°C. -3°.

-0.0127°C. 13

.

+10°
+2°.

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+5°............

In this experiment the temperature fell and rose unsteadily during the seven minutes of contractions, the maximum fall and the maximum rise being each 0.0423° C. At the close of the contractions the temperature stood at 0.0084° C. below the starting point. During the subsequent period of repose the temperature varied between 0.0127° C. below, and 0.0211° C. above, the starting point.

3rd Experiment.
1° deflection of galvanometer is equal to 0·004237°C.

Rise or fall of temperature.
Time from .
commencement Deflections of Thermometric
of contractions. galvanometer. values.

Comments.

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In this experiment the temperature fluctuated unsteadily, both during the contractions and during five minutes of subsequent inactivity. The maximum rise and fall during the contractions were equal, namely, 0.0211° C. During the period of repose the maximum fall was 0·0211° C., and the maximum rise was 0.0127° C. At the close of the experiment the temperature was 0·0211° C. below the starting point.

4th Experiment. 1° deflection of galvanometer is equal to 0.004237°C. At the end of 0 minutes ......

0°.........

0° Commenced contractions. 1, 2, 3, 4, 5, 6, 7, 1, 3 minutes. 6. 7:}

Stopped contractions. 9, 10, 11, 12, 137

, 13} minutes

No change of temperature either during or after the contractions.

5th, 6th, 7th, and 8th Experiments, made under similar conditions to 4th Experiment, gave similar negative results.

In the following two experiments the pile was placed on the left frontal eminence, 20 mm. from the median line :

9th Experiment.
1° deflection of galvanometer is equal to 0.004237°C.

Rise or fall of temperature.
Time from
commencement Deflections of Thermometric
of contractions. galvanometer. values.

Comments.

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During the whole time of the contractions, in the above experiment, the temperature fell steadily and decidedly, the maximum fall being 0.2838° C., attained at the close of the contractions. During the succeeding five minutes of inactivity, the fall reached 0.3135° C. below the starting point. The last value recorded was 0.2881° C. below the zero. The explanation of this fall is probably that already given of similar depressions of temperature (1st Experiment on extensors of leg, p. 6).

10th Experiment. 1° deflection of galvanometer is equal to 0.004237°C. At the end of 0 minutes

0° Commenced contractions. 1 2

-0.0211°C.

5° ......

0° ...............

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