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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.

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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.

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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 experiFrom them we obtain the following

ments on this muscle.*

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Experiments on the contraction of the trapezius and the levator anguli scapulæ. 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 linė 20 mm. to 40 mm. The pile was on the left side of the head, and the muscles of the right side were contracted.

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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.

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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.

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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.

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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:

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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).

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