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It is a tonic, antiperiodic, and febrifuge, and is used in medicine as a substitute for quinine.

In the typho-malarial form, especially in those cases in which the malarial element predominates, and in which there is a marked tendency to remission, the early administration of quinia in full antiperiodic doses is urgently called for.

But the latter disease arises exclusively from malaria, and is therefore powerfully influenced by season and locality; is not contagious; does not present anything approaching to the crisis, the apyretic interval, or the abrupt relapse of relapsing fever; presents pigmentary changes in the blood, instead of the spirillum; and lesions of the spleen and liver totally unlike those characteristic of relapsing fever; can be promptly controlled by antiperiodic doses of quinine, and therefore should have a mortality far less than that of the grave form of relapsing fever.

If the physician elects to give his antiperiodic in one or two large doses, he should not trust to so small an amount as eighteen grains.

At first the temperature tables indicate the prevalence of milk fever; next follow cases closely resembling those of mild paludal poisoning; and, finally, if these warnings are unheeded and reliance is placed upon antiperiodic remedies rather than upon prompt closure of the threatened ward, the pestilence develops.