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oil that should be avoided both from motives of economy and safety.

In respect to the test tables, No. 5 will be found especially important, as it proves conclusively that the best results in point of economy can be compassed by the use of the oils that bear a high fire-test, and evaporate but little.

In this table the oils tested are supposed to have been the oils used during the period covered by the computation of cost in all

cases.

In the compilation of these tables of cost with the tables given in Professor Ordway's experiments the undersigned has attempted to make them as clear as the case will permit, and he hopes that the errors which may be found will be excused in view of the somewhat complex nature of the work.

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THE NEW YORK PUBLIC LIBRARY.

ASTOR, LENOX AND TILDEN FOUNDATIONS.

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TEST TABLE NO. 2.-Flashing and Evaporation Tests of Oils obtained from Factories for Trial.

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