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are pushed forward in strait lines, by the action of fire, 

 or are reflected, or refracted in strait lines, they produce 

 light, and are so called. When the interposition of 

 opake bodies hinders their progress in strait lines, they 

 pass, but cease to produce light. 



These particles, which when moving in strait lines pro- 

 duce light, and when collected and put into another sort 

 of motion, produce fire, when the force impelling them 

 ceases to act with vigour, and when their motion is re- 

 tarded, cohere in small masses or grains, which Mr. 

 Hutchinson calls spirit, or air, and is of the same 

 kind and texture with that air which we daily 

 breathe. 



The sun fixed at the centre of this system, is included 

 111 a vast collection of this subtle matter, iu the form of 

 fire, which continually melts down all the air that is 

 brought into it from all parts or the system, into atoms, 

 and with an immense force, sends it forth in perpetual 

 streams of light, to the circumference. The whole space 

 comprehended within this, is absolutely full. 



The matter thus melted down at the orb of the sun, 

 moves outward to the circumference, and being forced 

 by the particles which are concreted into air at the ut- 

 most extremities, returns toward the sun, where the fluid 

 being most subtle, gives least resistance, ami takes up the 

 place that the ligiit left. 



And therefore this uninterrupted flux of matter from 

 the sun in light, in place of being an expense whiclr 

 would necessarily destroy that orb (an insupportable ob- 

 jection, Mr. Hutchinson thinks, to Sir Isaac Newton's 

 scheme,) is ihe very means of preserving it, and every 

 thing else in this ssste , in its aciioti and vigour, by pres- 

 sing back perpetual supplies of air. to be melted down 

 inta I gut, which produces a continual circulation. These 

 perpetual tides of matter outwards and inwards, in 

 every point from tue centre to the circumference, pro- 

 duce that constant gyration in the earth, and the planets 

 round their own centre, and round the sun. 



Besides the rotation of the orbs, the adverse motion 

 of the ligiit pushing toward the circumference, aud the 

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