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Things; and Men who study Things, feldom mind Words. A Man may have vast Ideas or Conceptions of Things, and little or none of Words, And most people who spend their Time in discovering any thing we do not know, or which is not in use, tell it us but confusedly at first.

'Tis neceffary that the Person who attempts to discover the Motions and Actions of Bodies whether Solids or Fluids, should have a large extensive Capacity, naturally, to compare many Ideas at once; a good Share of natural Reason, and be instructed fo far in the Mathematicks as concerns the Solids, or Fluids he obferves, to enable him to make just Obfervations, and to have sufficient Opportunity to make Observations and draw Conclufions; that he understand so much of one Language, that others, who understand the same Language, may understand what he defigns should be understood. But 'tis not necessary that he understand many Languages, nor that he know how many have made deficient Observations, and drawn falfe Conclusions. Such a Multitude of Opinions are likely rather to perplex or deceive, than to direct him to the Truth. Nay as our Comprehensions are not infinite, the more Ideas he has of

Things

Things which concern not the Matter in hand, the less room he will have for those that are necessary.

The present Physicians read the Obfervations former Physicians have made ; what Symptoms attend this or that Dif ease in their several Stages, and can thereby guess what the Patient has undergone, and what he has yet to undergo ; and likewise the Effects that this or that fort of Medicine has had in clogging or discharging the Matter, which, in this or that Case, produces such or such Sympos toms; but this should be the least part of a Physician's Skill. Few or none of them ever look back to the Cause, and fhew us whence that Disease took Root, and what Causes produced those Effects. The principal Part should be to judge what the Matter is that offends, and how it offends; how it was produced or retained, and why it was not discharged ; if any of the Glands have been too straight, to widen them; and if any have been too wide, to straighten them; or if the Juices have been too subtle, or too crafs, to change them; if any sort of Meat, Drink, Action, either by Excess, Quality, or Deficiency, have produced it, to direct the contrary both in Quantity

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and Quality; that what offends might be discharged naturally without Force; and any new Productions or Increase of it, for the future prevented; why this is not better cleared, whether 'tis because they think so long as they act by Example, they are fafe ; or 'tis because it requires too much Labour and Study to understand natural Causes; or that 'tis below them to condescend to make Observations upon the most common-or minute Things, and to begin to lay their Foundation on the Ground, and so build upwards; or that Disorders come by chance, and are best cured so; or that 'tis such a Mystery that it can never be made a Science, or that 'tis against their Interest it fhould be made so; or whatever be the Reason, till the prime Agents be known, which work every thing in us, and the Manner how they act, and their Actions be demonstrated by plain, simple, mathematical Rules (I had like to have said mechanical) 'tis impossible for them to lay down plain Rules how to prevent Disorders, remove them, or prevent their Returns. If ever those Matters be set in a clear Light, it must be by those who stoop so low as to make. Observations upon all, even to the most minute Things,

Motions, Motions, and Circumstances, which any way affect, or concern the Body, and without Regard to the received Notions or Opinions, give Judgment as the Things appear to them; and whenever there is an Attempt to do it, 'tis the fairest way to let the Brat have no Credit, nur Dićcredit by the Parent; and if after 'tis set forward, it cannot live by itself, to let it . die.

c H A P. I. Some Positions about the Motion of Bodies

in Fluids.

TAtt empt not to account for the Qua1 lities of Bodies, either Solids or Fluids, such as Gravity, Elasticity, &c. Nor for Primary the Sizes, Shapes, or Figures of the first Qualities Corpuscles of each several Species of or to be Bodies, whereby each of the Bodies dif-for by us. fer from any other in several Qualities or Attributes : Those, and the Confequences which result from them, shew the great Power and Wisdom of the Creator, but come not within the Reach of Observation: Thereby we can only know what Qualities, Sizes, Figures, &c. those Maf

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fes which come under our Observation have, and how some of them move, and are moved, impelled, and rebounded by themselves or by one another, downward, upward, &c. and how others are interrupted, and rest, by the different Qualities, or different Degrees of those Qualities in their several Mastes; and how those Motions are successively renewed or repeated, their Directions varied, and how they move and rest alternately, by the Diminution, Augmentation, or Complication of some of those Qualities occafioned by the Alteration in Magnitude, Figure, or Dimenfion of some, the Mafies being divided, united, compressed, extended, &c. And consequently how the several other Qualities or Attributes which result from the Size, Figure, Contexture, Mixture, &c. of the Maffes, such as blunt, sharp, hard, soft, porous, solid, brittle, flexible, &c. are altered or complicated.

In the common Course of Nature here, all Compositions or gross Bodies are formed, and all Corpuscles, or small Maffes move in Fluids; and they and the Fluids are moved, either by external Causes or Agents, as Wind moves the Water, and Bodies in it, &c. or by the Impulse of some Agents put into Motion before they

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