Perhaps the most common form of exhibiting mercury in this place, with a view of entering the system, is that of the mercurial pills. These, when properly prepared, seem, in most cases, to be justly entitled to the preference, which is here so frequently given them. The mercury, in this preparation, is rendered active by the same means, and is in the same state as in the preceeding one. Its operation likewise in this form is very analogous to what it is in the one formerly mentioned. It is here equally apt to salivate as in the form of unction. But the salivation induced by the mercurial pills very rarely arises to so high a degree, at least so suddenly, as from unction. The quantity of mercury introduced into the system in this form, admits of being more certainly ascertained than by unction. The principal ambiguity which takes place with regard to the pills, arises from the difference of care with which they are prepared, and the degree of solubility in the stomach which those substances possess with which the mercury is combined. The mercurial pills affect the guts less than many other preparations of this metal. This indeed might be inferred from considering that the mercury is here in a very mild state. From the use of mercurial pills, mercury may be introduced into the system in very considerable quantities. But, as in this form it is not readily discharged by the different emunctories, it is apt to be accumulated in a greater quantity than is requisite for slight cases. In these, therefore, the pills are not so advisable as some other preparations. But, where the alimentary canal can bear mercury with ease, the mercurial pills are perhaps preferable to any other form, for those obstinate cases where it is requisite, that a considerable quantity of the medicine in an active state should be introduced into the system. And they are particularly proper in those cases which are only to be overcome by a gradual and long continued use of mercury. To the forms of exhibiting mercury which have already been mentioned, those lately introduced by Mr Plenck of Vienna may properly be subjoined. Of the various preparations which he has proposed, what he seems chiefly to have used himself, and what has been principally employed here, is his simple mercurial solution. What is to be said, then, concerning his preparations, as they are all very similar in their nature, may be confined to this form.