We may also fairly conclude from this Reasoning, that the safest way of raising a _Salivation_ is by _Internal_ Medicines; since whatever Mischiefs can be apprehended from _These_, may in a greater degree follow from the _External_ Use of _Mercury_; not only because, as We have already hinted, the Mineral _Globules_ being intimately combined with Salts in the several Preparations given inwardly, will by the Irritation of These, be easily and fully thrown out at the Organs of Secretions, till the Blood is quite discharged of its Load; whereas, in all the Dawbings with Mercurial Ointments, We can never be certain that none of the heavy Particles are left lodg’d in the _Interstices_ of the _Fibres_ or _Cells_ of the _Bones_; But also, in as much as by computing the Portion of _Mercury_ in all the Doses necessarily to promote a Spitting, and the Weight of the same Mineral usually apply’d when this is done by Unction, it will appear, that the quantity in the latter Case vastly exceeds that in the former, and consequently that the Inconveniencies to be feared will be in the same proportion. Therefore this External Management of _Mercury_ is only to be allow’d of, where either the Case will bear the Violence of such a Method, or outward _Ulcers_ and _Tumors_ require a particular Cure by _Liniments_, &c. Nor is it improper to Remark that, We do hereby see how the Use of this Mineral comes to produce that Effect so often complain’d of, (tho’ not always with Reason) of making the Bones Foul or Carious. For, if the _Laminæ_ or _Fibres_ of These are already so much broken and spoiled by a Disease, as that the Circulation of the Fluids thro’ ’em can’t be maintain’d, they must necessarily be corrupted more by the Weight of the _Mercurial Globules_; tho’ here also it is plain, that the _outward_ Use of this Remedy will be more to be blamed than the _inward_. And indeed, as the earliest Use of _Mercury_ was in _Unguents_ and _Emplasters_, so most of the Prejudices and Out-cries against It are owing to Effects produced this way. For the first attempts of the Cure of _Venereal Maladies_ by this Remedy, were learned from the _Arabians_ (123), who having recommended _Mercurial_ Ointments in the _Lepra_ or _Scabies_, gave a handle to the _Italian_ Physicians to try their Efficacy, in removing the Foulness of the Skin from a new and terrible Contagion; neither were they sparing of their Liniments, which they continued to rub in for 12, 15, nay, sometimes for above 30 Days together (124). So that it is no wonder if they often met with very untoward Symptoms from so severe a Treatment, and if, (as some of them (125) do affirm) they now and then found _Mercury_ in the rotten Bones of their Patients, who had, it may be, suffered too much both from their Disease and their Physician. * * * * * Thus much of _Mercury_. Let Us in the next place examine _Arsenick_, about the Nature and Composition of which Authors are very much puzzled.