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This lard oil cannot be properly tested in a small lamp since it does not contain oil enough to last beyond a few hours not long enough to [[?]] the wicks

The great difficulty in determining the solidifying degree of lard oil is the [[?]] property which it
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possesses of [[freezing?]] at a lower temperature when submitted to it for a long time.

The oil we tested April 1866 stood a temperature of 33 and then solidified at about 40 when it was solidified at 32 it suddenly rose to 36° and there remained. This I suppose was due to the [[going?]] out of the latent heat.