CONSTITUENTS OP THE UNIVERSE. 



simple, and the statement that only two 

 motions are involved, is none the less likely to 

 be true on that account. 



Motion is either primary or secondary. 

 The primary motions are either spiral or 

 radial, except such modification as may occur 

 from the circumstance that all motion is prob- 

 ably compound. 



Both of these motions are progressive; but 

 the spiral, unlike the radial, is a motion that 

 seems to be chiefly, if not wholly confined or 

 restricted to the limits of the various masses 

 in the universe; while the radial is not thus 

 circumscribed. The latter is the motion trans- 

 mitted from one mass to others at such tre- 

 mendous speed, and practically in a straight 

 line, that being the shortest line also between 

 two separate points. This motion is the means 

 of connection between different masses, or the 

 motion of transmission; and in conjunction 

 with the spiral it is the real source also of the 

 secondary movements, such for instance, as 

 are manifested on the surface of the earth. 

 This straight line motion is simple and appro- 



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