and which elsewhere he says is not sufficient for the illustrating the Province of one _Disease_; but that we lie under a Necessity of taking in Materials from all Hands. But there is no Man that we know of, has spoke more agreeably of this Matter than Dr _Harris_, in his _Pharmacologia Anti-Empirica_, he owns that he took more than ordinary Pains in one particular _Disease_, and assures us he verily believes if learned Men, after a compleat Acquisition of the universal Method of _Physick_, and a necessary Search into the Nature and Cures of those manifold Infirmities and Diseases, which, with a kind of infinite Variety, do afflict Mankind, would, with their utmost Vigour and Resolution, prosecute the Knowledge of some one _Disease_ eminently above others; they would, most certainly, find a particular Providence attending and assisting them in so good and honest a Design. He adds, a few Pages farther, that wherever a Man’s Thoughts are intent and fixed, wherever his Genius does naturally incline, and all his Aims and Application do continually tend, whether it be to pertinent or insignificant Matters; whether it be to useful, or else meerly curious Things; if he has but tolerable Parts, and Education corresponding, he can hardly ever miss; it is hardly possible he should miss the becoming Eminent, and in great Measure perfect, (I mean perfect (says he) according to the Modulum of Human Capacity) in that one Point. But there is one Thing to be recommended to the Consideration of the Person, who takes upon him the Enquiry into the Nature of one particular _Disease_, which perhaps he might be very liable to err in, if not cautioned against; and that is, that he be not too bold and rash in his Attempts; for, as _Galen_ says, _The_ Physician’s _Art is not like that of an_ Artificer, _who may make what Experiments he pleases, to satisfy his Curiosity; because if he spoils the Materials he works on, no Body is endangered by the Miscarriage: In Corpore autem humane_ (adds he) _ea tentare quæ non sunt Experientium comprobata Periculo non vacat, cum temerariæ Experientiæ Finis sit totius Animantis internecio_. I believe we shall find that one of the grand Reasons, why Persons, generally speaking, have been so negligent in making any Attempts on _Cancers_, has been the seeming Discouragement they have all along met with from Authors. The Caution _Hypocrates_ has given us in his Thirty eighth _Aphor. Sect._ 6. has scarce been omitted by any one considerable Person that has wrote of this Subject, tho’ perhaps the Sentence has often had an Exposition put upon it, contrary to the Author’s Meaning; but of this, more in it’s proper Place. I proceed now to give an Idea of _Cancers_ in the Breast from an external Cause; and this I shall do without concerning my self with the Opinion of the Ancients; for since we have been so happy as to live in an Age which will be remarkable for the many surprising Discoveries which have been