17 Feb. 1815

Didacologia

Ch. Art & Science Division

16

16

In so far as human observation has been able to apply itself to the subject, absolute motion is at all times among the inherent inseparable properties of every distinct body, and, in so far, of every particle of matter. But of relative motion, motion as between any two bodies or particles of matter considered in relation to one another, examples, real or apparent, may upon the surface of this our globe be found in abundance.

Of relative motion or its negation relative rest, no idea can, it should seem, be formed, otherwise than by the help of the idea of time. Two distinct bodies, in so far as in the course of a given length of time, the distance that intervenes between them is observed to be, or appears to be, different, are observed to have been one or both in motion with reference to each other - to have been, one or other, or both of them, in a state of relative motion; - in so far as no difference in respect of the amount of the distance between them has been observed, or is supposed to be observable, they are considered /regarded/ as having been in a state of rest.

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    5. Motion. 6. Rest. 7. Action. 8. Passion.

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    In the idea /consideration/ /notion/ of motion that of time is moreover involved; and again that of place, as being that in which the idea of time is, by the like necessity, involved.

    In motion a body cannot have been but it must have been in two different places, at or in two different, which is as much as to say, in two successive portions of time.

    For the space of time in question, i.e. for a portion of time composed of those same portions which were operative in the case of motion, the body has been at rest, in so far as in all that space or length of time it has not changed its place with reference to any others.

    Taken in the aggregate, in so far as can be concluded, either from observation or from analogy in the way of inference, no body whatsoever is, or ever has been, or ever will be, absolutely in a state of rest, i.e. without being in motion with reference to some other body or bodies.

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    Of these eight abstractions, six, viz. 1. Place; 2. Motion; (viz. relative motion) 3. Time; 4. Number; 5. Figure; 6. Quantity - in a word, all but vacuity or void space and rest, have furnished so many distinguishable branches of science - branches, let us say, of Choristoscopic Somatology, each of them already furnished with a separate name, how far soever from being uniformly apposite and expressive.

    I. Sciences having for their Subject the Predicament of Place.

    Topography a term confined in its customary application to small portions of the surface of our earth though with equal original propriety applicable to any portion or portions of the whole universe. Chorography, a term not much in use, but, when in use, applied to portions larger than Topography is commonly applied to. Geography - a term exclusively and necessarily as its etymology shows, confined to this our earth, and subject to that limitation, applicable to any portions, so they be not so small as that the propriety of the application shall find on the part of Topography a ground or pretence for disputing it.

    By Uranography or rather /still better/ by Uranognosy, rather than Astronomy, may that branch of Topography, taken in its largest sense, which remains after the subtraction of Geography be designated. Uranognosy rather than Uranography; because, while on our earth the situations of its several parts, with relation to each other when measured upon a large scale, are never observed to undergo any considerable change, those of the bodies of which the whole universe is composed are as far as observation or indication may be depended upon - are all with relation to each other in a state of constant relative motion; and accordingly their relative situations undergoing continual change.

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    The attention which it applies to its subjects somatology may either apply indiscriminately to all the properties observable in them, or confine itself to any one or more of them to the exclusion of the rest; in the first case, ageledodiascopic, or, for shortness, ageledoscopic - in the other case, choristodiascopic, or, for shortness, choristoscopic, are the names by which it may respectively be distinguished.

    Vacuity, rest, time, figure, quantity - all these form so many distinguishable subjects of choristoscopic somatics.

    Of vacuity it may seem that it belongs not to the properties of body, But, be the body what it may, and be the place which, at the time in question, it occupies what it may, it may as easily be conceived to be absent from as present at, and in that place. To be either in or out of any given place is, therefore, among the properties of body; for, if there were no such being as a body, there would be no such distinction as that between place and place.

    It is only by abstraction that the idea of rest can be formed any more than that of body: it has for its ground the idea of place. It is the absence of motion, and of motion itself no idea can be formed but what has for its ground the idea of place.

    Take at any time into consideration any body, considering it with reference to the place which, at that same time, it occupies; but, from that same place conceive it removed, and into that same place suppose no other body or portion of matter introduced. In this way, and no other, is formed the idea of a vacuum or portion of unoccupied space.

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