An essay on the powers and mechanism of nature; : intended, by a deeper analysis of physical principles, to extend, improve, and more firmly establish, the grand superstructure of the Newtonian system. / By Robert Young.
- Young, Robert
- Date:
- M DCC LXXXVIII. [1788]
Licence: Public Domain Mark
Credit: An essay on the powers and mechanism of nature; : intended, by a deeper analysis of physical principles, to extend, improve, and more firmly establish, the grand superstructure of the Newtonian system. / By Robert Young. Source: Wellcome Collection.
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![[ 1*5* ] The accessory activities are super- h INDUCED UPON BODIES BY THE ACCESSION Of A NEW ACTIVE SUBSTANCE, DISTINCT FROM THE CONSTITUENT (e II4). Por bodies exift inactive by the equilibri- um of the CONSTITUENT AC TI V I TI E S (f 114-) ; if, therefore, bodies are adive, as in the accef- fory adivities (g 114), fince they are not adive by their innate or coNSTiTuENT active sub- stance, they become fo by a new and fuper- added active substance. The new active substance, which induces ^ the ACCESSORY activities may be called the accessory active substance. There are, therefore in a body, two forms of 1;^ the active substance, one is the effential a.ctive substance which conftitutes the body, in a manner to be explained; the other is the occafional active substance by which a body is, in any way, made active, as in gra- vity or projedion. Therefore all the origins of acti- l viTY enumerated (a io8) serve to impart THE accessory ACTI V E SUBSTANCE TO BODIES, ,A N D W her E.AC TI VITY IS WITHOU T.A N Y M A N I - See Chap. VI. Q 2 FEST](https://iiif.wellcomecollection.org/image/b2878196x_0143.jp2/full/800%2C/0/default.jpg)
