’Tis not improbable also, but that the sense of _feeling_ may be highly improv’d, for that being a sense that judges of the more _gross_ and _robust motions_ of the _Particles_ of _Bodies_, seems capable of being improv’d and assisted very many wayes. Thus for the distinguishing of _Heat_ and _Cold_, the _Weather-glass_ and _Thermometer_, which I have describ’d in this following Treatise, do exceedingly perfect it; by each of which the least variations of heat or cold, which the most Acute sense is not able to distinguish, are manifested. This is oftentimes further promoted also by the help of _Burning-glasses_, and the like, which collect and unite the radiating heat. Thus the _roughness_ and _smoothness_ of a Body is made much more sensible by the help of a _Microscope_, then by the most _tender_ and _delicate Hand_. Perhaps, a Physitian might, by several other _tangible_ proprieties, discover the constitution of a Body as well as by the _Pulse_. I do but instance in these, to shew what possibility there may be of many others, and what probability and hopes there were of finding them, if this method were followed; for the Offices of the five Senses being to detect either the _subtil_ and _curious Motions_ propagated through all _pellucid_ or perfectly _homogeneous_ Bodies; Or the more _gross_ and _vibrative Pulse_ communicated through the _Air_ and all other convenient _mediums_, whether fluid or solid: Or the _effluvia_ of Bodies _dissolv’d_ in the _Air_; Or the _particles_ of bodies _dissolv’d_ or _dissoluble_ in _Liquors_, or the more _quick_ and _violent shaking motion_ of _heat_ in all or any of these: whatsoever does any wayes promote any of these kinds of _criteria_, does afford a way of improving some one sense. And what a multitude of these would a diligent Man meet with in his inquiries? And this for the helping and promoting the _sensitive faculty_ only. Next, as for the _Memory_, or _retentive faculty_, we may be sufficiently instructed from the _written Histories_ of _civil actions_, what great assistance may be afforded the Memory, in the committing to writing things observable in _natural operations_. If a Physitian be therefore accounted the more able in his Faculty, because he has had long experience and practice, the remembrance of which, though perhaps very imperfect, does regulate all his after actions: What ought to be thought of that man, that has not only a perfect _register_ of his own experience, but is grown _old_ with the experience of many hundreds of years, and many thousands of men.