Method of curing _Cancers_ by Medicines only, will find that it will not consist in a Secret for purifying the Juices, which can have no Effect on the _Cancerous Mass_, so as to procure it’s Dissolution; and without a Remedy for which his Method will be always unsuccessful. _Mercklin_, in his Treatise _de Transfus Sanguinis_, page 35, tells us we have no Reason to believe we may have Success from Transfusion in a _Cancer_, nor indeed would Injections succeed better; though, perhaps, by this Means, it is possible so to alter the Fluids, that _Ulcers_, not _Cancerous_, may be cured in a short Time, as it once happened to a certain Person, who being under Cure for an inveterate Pox, had some _Rosin_ of _Scammony_ infused in the Essence of _Guaiacum_, injected into his Veins, which Vomited him excessively; but his _Ulcers_ were healed in three Days Time. From what has been hitherto said, it is evident, that a _Salivation_ can never cure a confirmed _Cancer_, because it is not capable of procuring a Dissolution of that hard Substance, which is the real _Cancer_ it self. The Glands we have observed, with the extravasated _Lympha_, and its Vessels, are perfectly changed to a different Substance to what they were before, all which make a _Mass_ of such a Nature, that it will be impossible to procure it’s Dissolution by any inward Means. If the _Cancer_ was nothing more than a Coagulation of the Juices in the Vessels, or other Canals, or Pipes, the Cure might be much more easily effected, but as the _Cancer_ is conjoined with such Circumstances as we have mentioned, we may affirm the Cure will be altogether impossible without the whole Substance with it’s Appendices or Branches (which we have found they often have) be taken away; or a perfect Dissolution of all of it be procured by some external Remedy, which is capable of operating on it after such a peculiar Manner, as to dissolve the _Cancerous Substance_, without having any such Effect on the contiguous Parts. PROBLEM V. _Whether Cancers are Curable by Causticks._