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It had previously been made chiefly from the dry distillation of wood; hence most of Britain's acetone was imported from timber-growing countries like the United States.

One pound of amber yields about half an ounce of crude acid, and the glass retort, after dry distillation, must be broken to collect the acid.

By the dry distillation of rosin, there is yielded a series of heavy dark oils consisting principally of hydrocarbons, resinous bodies, and free acid.

Destructive distillation, or dry distillation, differs from the preceding in this respect, that the original substance is not merely broken up into bodies by the mixture of which it is formed, but is so treated that it is further decomposed, and products are obtained which were not present uncombined in the original material.

A solution, equivalent in effect to a 2 per cent. solution of acetic acid, could be obtained at a comparatively cheaper cost than crude pyroligneous acid produced by dry distillation as it was then being practised.