of which there have been such direful Accidents related by _Crato_, _Massaria_, and _Zacutus Lucitanus_. I do not think it impossible, but that _Arsnick_ may be prepared after such a manner as may, by the addition of some convenient Body, or depriving it of its noxious Particles, qualify it for effecting uncommon things in the Cure of this Disease, without causing the Surgeon to repent the use of it. I remember that _Helmont_ somewhere says one may easily enough correct several sorts of Poisons, so that they shall not be deprived of their Force, when we destroy their Virulency. Many Instances of this Nature we meet with in Mr _Boyle_, and some others; but that which makes most for my present purpose, is, what is mentioned by the last Honourable Gentleman, of a very ingenious Man he knew, that was famous, as well for his Writings, as for a Remedy to cure _ulcerated Cancers_ in Womens Breasts, without any considerable Pain. He assured our Author that his Medicine was indolent, and mortified the ulcerated Parts as far as they were corrupted, without disordering the Party, and this Remedy it seems partly by the Confession of the Gentleman, was reasonably enough supposed to be a Dulcification of _Arsnick_; one would think that the mention of this very Remedy, with Monsieur _Alliot’s_, and that recommended in the preceeding Letter, should be sufficient to influence the inquisitive of our Profession to farther Enquiries, which must be certainly an Undertaking, worthy the noblest Spirits. To conclude, we cannot say, but there are many Cancers that may be cured by Causticks, but the Person that is to undergo it, may very well answer, as a certain Patient did, who’s Thigh was to be cut off, _Non est tanto digna dolore Salus_. _The Preservation of Life would be too dear bought at the Price of so much Pain._ This puts me in Mind of what is related of _Galienus_ the Emperor, who it seems had for a considerable time been very grieviously afflicted with a _Sciatica_, a certain Physician undertaking to cure him, performed indeed his Promise, but nevertheless made him undergo a thousand painful Experiments; whereupon, the Emperor one Day sent for, and thus said to him, _Take_ Fabatus _two Thousand Sesterces, but withal, be informed I give them not for curing my_ Sciatica, _but that thou may’st never cure me again_. PROBLEM VI. _Whether Cancers are Curable by internal Medicines._