400 E. Frankland on the Source of Muscular Power. 
duced must obviously, in overcoming atmospheric pressure, per- 
form an amount o < equivalent, in round numbers, to the 
lifting of a weight of 15 lbs. to the height of one inch. In per- 
forming this work the gases are cooled, and consequently less 
heat is communicated to the water of the calorimeter. Never- 
theless, the loss of heat due to this cause is but small. Under the 
actual conditions of the experiments detailed below, its amount 
would only have inereased the temperature of the water in the 
ealorimeter by 0°07 C. Even this slight error is entirely elim- 
inated by the final eorrectiori which we have now to consider. 
It is well known that the decomposition of chlorate of potash 
into chlorid of potassium and free oxygen is attended with the 
evolution of heat. Ifa few grains of peroxyd of manganese, or 
eo of peroxyd of iron, be dropped into an ounce or two 0 
lst experiment, 
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