Sec. 18. This made him very desirous to find that part if possible, that he might remove the defect from it, that so it might be as it us'd to be, and the whole Body might enjoy the Benefit of it, and the same course of Actions follow as before. He had before observ'd, in the Bodies of Wild Beasts and other Animals, that all their Members were solid, and that there were only three Cavities, _viz_. The Skull, the Breast, and the Belly; he imagined therefore that this Part which he wanted, must needs be in one of these Cavities, and above all, he had a strong persuasion that it was in the middlemost of them. He verily believ'd, that all the Members stood in need of this part, and that from thence it must necessarily follow, that the Seat of it must be in the Centre. And when he reflected upon his own Body, he felt such a part in his Breast, of which he had this notion, _viz_. That it was impossible for for him to subsist without it, so much as the twinkling of an eye, tho' he could at the same time conceive a possibility of subsisting without his other parts, _viz_. his Hands, Feet, Ears, Nose, Eyes, or even his Head. And upon this account, whenever he fought with any Wild Beast, he always took particular care to guard his Breast; because of the Apprehension which he had of that Part, which was contain'd in it. Sec. 19. Having, by this way of reasoning, assur'd himself that the disaffected Part lay in the Breast; he was resolv'd to make a search, in order to find it out; that whatsoever the Impediment was, he might remove it if possible; but then again, he was afraid on the other side, lest his Undertaking should be worse than the Disease, and prove prejudicial. He began to consider next, whether or no he had ever remembred any Beasts, or other Animals, which he had seen in that condition, recover again, and return to the same State which they were in before: but he could call to Mind no such Instance; from whence he concluded, that if she was let alone there would be no hopes at all, but if he should be so fortunate as to find that Part, and find the Impediment, there might be some hope. Upon this he resolv'd to open her Breast and make enquiry; in order to which he provides himself with sharp Flints, and Splinters of dry Cane almost like Knives, with which he made an incision between the Ribs, and cutting through the Flesh, came to the _Diaphragma_; which he finding very Tough and not easily broken, assur'd himself, that such a Covering must needs belong to that part which he lookt for, and that if he could once get through that, he should find it. He met with some difficulty in his Work, because his Instruments were none of the best, for he had none but such as were made either of Flint or Cane.