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Cantharides, absorbed from a blister, may produce it temporarily.

As early as 1826, Bretonneau, by the introduction of tincture of cantharides and olive oil into the trachea, succeeded in producing a "dense, elastic, reed-like membranous concretion."

A dangerous compound of the latter sort introduced during the first epidemic of cholera in this country became officinal under the name of liniment of cantharides.

It should, however, be mentioned that, according to Macnamara, if the patient does not pass any urine within thirty-six hours of reaction coming on, ten minims of the tincture of cantharides in an ounce of water should be given every half hour until six doses have been taken, and the patient encouraged to drink freely of water.

In rare cases either albumen or sugar has been detected; the former may have been due to the action of blisters of cantharides used in the treatment of the disease.