112	QUANTITATIVE AGRICULTURAL ANALYSIS
Substituting the value of C,

8

= cal per gm.

(3)

.

The water equivalent may be calculated from the known
weights and specific heats of all of the parts of the calorii»<3t>or
but it is better determined experimentally by burning a x>tlu*°
substance of known heat of combustion, such as naphthaJone
or cane sugar.

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