parts infinitely small ; yet the s-mallness of the particles 

 of several bodies, is such as vastly surpasses our 

 conception. And there are innumerable instances 

 in nature of such parts actually separated from each 

 other. 



Mr. Boyle gives us several instances of this : he 

 speaks of a silken thread three hundred yards long, 

 that weighed but two grains and a iralf. Fifty square 

 inches of leaf-gold weighed but one grain. Now if 

 the length of an inch be divided into two hundred 

 parts, the eye may distinguish them all ; therefore, 

 there are, in one square inch, forty thousand visible 

 parts ; and, in one grain of leaf-gold, two millions of 

 such parts : which visible parts no one will deny to be 

 farther divisible. In odoriferous bodies, we may dis- 

 cern a still greater subtlety of parts, yea, of parts 

 actually separated from each other. Several bodies 

 scarce lose any thing of their weight in a long time, 

 and yet continually fill a large space with odoriferous 

 particles. Several animals are but just visible with 

 the finest microscope : and yet these have all the 

 parts necessary for life, as blood and other juices. 

 How wonderful must the subtlety of the parts be 

 whereof those fluids are composed : and hence the 

 following strange theorem is deduced and demonstrated 

 by Dr. Keil. " Any -particle of matter, how small 

 soever, and any infinite space, how large soever, being 

 given, it is possible for that particle to be diffused 

 through all that space, and to fill it in such a manner 

 that there shall be no pore in it whose diameter shall 

 exceed any given line." 



5. The last general property of matter is motion 

 avid rest ; for it is plain all matter is either at rest or 

 in motion. God is the first and universal cause of motion, 

 as well as of all these tilings : the immediate cause of 

 it is either matter or spirit. It is beyond doubt, that a 

 body moved communicates its motion to another, 

 though in its own nature it be purely passive. Nor 

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