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241) Can these animals be said to see by the help of luminous bodies? 12. A piece of Iron hot enough to burn casteth no light; why? The sole end of all these queries is to determine; 1. whether [[underline]] Light [[/underline]] is an emanation from luminous bodies. 2. And whether [[underline]] Light [[/underline]] and [[underline]] Heat [[/underline]] are one and the same thing. Thus far the Querist. [[strikethrough]] I find them extracted [[/strikethrough]] I find the 9 first extracted from Nature Displayed 8. [[superscript]] vo [[/superscript]] 1739. Vol. IV. Dialog. XI. p. 147. &c. or in Nature Delineated 12. [[superscript]] mo [[/superscript]] 1744. Vol. IV. Discourse XI. p. 90. To which is added these two on fire. [[left margin]] Two Queries on Fire [[/left margin]] 1. A violent fire, as lightning, and large hail-stones often proceed out of the same cloud. Can this be true? 2. Air increases fire, and yet the blast which animates the fire of the hearth would extinguish the taper: the same fan equally cools and lights our fire. Quere this? [[left margin]] My own considerations on Fire. [[strikethrough]] [[?]] [[/strikethrough]] see the next page. _ [[/left margin]] These drew me to consider the nature of Fire, on April 22. [[superscript]] d [[/superscript]] 1768, which I put down as follows It appears to me that FIRE is a substance, or a fluid [[underline]] per se [[/underline]], existing in three different states and conditions; and that Fire, Light, Heat, Air, Darkness and Cold are all one and the same thing. I. [[underline]] Fire in Orb [[/underline]], heats burns and shines, besides many other properties of penetrating [[strikethrough]] into [[/strikethrough]] [[insertion]] ^ between the pores of [[/insertion]] other bodies, &c. II. When the most subtle and minutest parts are dissipated, and proceed [[insertion]] ^ ed [[/insertion]] so far as to cause the fire to lose the properties or qualities of heating, burning and shining conjointly, I call it [[underline]] Fire disseminated [[/underline]]; which 1. Retains the property of shining, either with or without [[underline]] heat [[/underline]], and is then what I would call [[underline]] Light [[/underline]]. 2. It Retains the property of heating, with or without shining, and this I call [[underline]] heat [[/underline]] ; making [[underline]] Light [[/underline]] and [[underline]] heat [[/underline]] only two different sensible [[underline]] qualities [[/underline]] of Fire. III. When this [[underline]] disseminated Fire [[/underline]] becomes so languid as just to lose the two last sensible qualities, I would call it [[underline]] Air disseminated [[underline]] ; and this hath 1. The property or quality of [[underline]] darkness [[/underline]] either with or without cold. Or 2. The property or quality of [[underline]] Cold [[/underline]] either with or without [[underline]] darkness [[/underline]]. IV. And when it hath obtained or acquired these two sensible qualities of [[underline]] darkness [[/underline]] and [[underline]] cold [[/underline]] in the most intense degree, as Fire in Orb hath those of [[underline]] light [[/underline]] and [[underline]] heat [[/underline]] , I would call it [[underline]] Air quiesent [[/underline]]: So that [[underline]] Fire in Orb [[/underline]] and [[underline]] Air quiesent [[/underline]] are the two extremes of all the
Transcription Notes:
Used [[left margin]] for side notes.
Used [[insertion]] for inserted text in a sentence using " ^ ".
8 vo is Octavo, probably representing the eighth month, August.