This paper gives t he results of bomb calorimetric measurem ents of heats o f co mbu stion at 30° C of o ne sample of cellul ose and four samples of nitrocellulose fr om cotto n linters, and of one sample of cel lulose and four sampl es of nitrocellul ose from wo od pulp. Th e res ults have been combined with values for the heats of formation of carb on d ioxide a nd wate r to obtain values of heats of formation of t he celluloses a nd nitr oc e lllllo~es . Emp ir ical equations are given ex

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... ssin g heat of combustion and h eat of formation of the nitrocel luloses as fun ctio ns of nitrogen conte nt.