For these experiments every medicinal substance must be employed quite alone and perfectly pure, without the admixture of any foreign substance, and without taking anything else of a medicinal nature the same day, nor yet on the subsequent days, nor during all the time we wish to observe the effects of the medicine.

For these experiments every medicinal substance must be employed quite alone and perfectly pure, without the admixture of any foreign substance, and without taking anything else of a medicinal nature the same day, nor yet on the subsequent days, nor during all the time we wish to observe the effects of the medicine.