starting point, and rising still higher by 0.00704° C. in the succeeding minute.

19th Experiment.

1o deflection of galvanometer is equal to 0·0070422°C•

In this experiment a marked and rapid rise of temperature ensued, amounting at the close of the experiment to 0.5° C. above the starting point. The comments made upon 17th Experiment are equally applicable to the present case.

20th Experiment.

1° deflection of galvanometer is equal to 0·0070422°C.

In the above experiment the initial temperature remained unaffected during seven minutes' muscular action. During five minutes subsequent repose the temperature fell 0·014° C.

21st Experiment.

1° deflection of galvanometer is equal to 0.0070422°C.

In this case, for the first six minutes of contractions, the temperature was unaffected, but in the seventh minute a fall of 0.014° C. took place. During six and a half minutes' repose following the contractions the temperature fluctuated about the starting point, with an equal range above and below the latter of 0.0211° C.

Time from

22nd Experiment.

1o deflection of galvanometer is equal to 0·0070422°C.

commencement of contractions.

At the end of

In this experiment, during eight minutes' contractions, the temperature oscillated about the zero, with an equal range above and below this point of 0.0281° C. Eight minutes of repose, following the contractions, showed no change, the fluctuation continuing with the same limits as before.

23rd Experiment.

1° deflection of galvanometer is equal to 0·0070422°C.

No change of temperature either during or after the contractions.

Time from

24th Experiment.

1° deflection of galvanometer is equal to 0·0070422°C.

commencement

Rise or fall of temperature.

Thermometric

of contractions.

At the end of

0 minutes

Deflections of

galvanometer.

0°..........

No change of temperature either during or after the

contractions.

25th Experiment.

1° deflection of galvanometer is equal to 0.0070422°C.

1o deflection of galvanometer is equal to 0·0070422°C.

No change of temperature either during or after the contractions.

27th Experiment.

1° deflection of galvanometer is equal to 0.0070422°C.

No change of temperature either during or after the contractions.

Time from

28th Experiment.

1° deflection of galvanometer is equal to 0·0070422°C.

commencement

of contractions.

Rise or fall of temperature.

Deflections of

galvanometer.

Thermometric

values.

0°

Comments.

Commenced contractions.

Stopped contractions.

No change of temperature either during or after the contractions.

29th Experiment.

1° deflection of galvanometer is equal to 0·0074022°C.

No change of temperature either during or after the contractions.

30th Experiment.

1° deflection of galvanometer is equal to 0.0074022°C.

No change of temperature either during or after the contractions.

No change of temperature either during or after the contractions.

32nd Experiment.

1° deflection of galvanometer is equal to 0·004166°C.

In this experiment the rise was probably in great part due to an elevation of the general thermal level, such as we have before considered in 17th and 19th Experiments. There was in this case no observation of the temperature after the close of the contractions.

We will now analyse the thirty-two experiments thus far given; and to this end, we will first divide them into eight classes, as follows, giving the numbers and percentages of cases belonging to each class, and also designating the particular experiments in which they are found: