CONSTITUENTS OF THE UNIVERSE. 



ably a curved one, that no single force will 

 produce. Next it has a motion with the earth 

 around the sun, which is a spiral that would 

 require at least three different forces to 

 accomplish; and finally another spiral move- 

 ment around the spiral path of the earth. 



Remember that all of these complex move- 

 ments of the moon are specific and continuous, 

 and would require a great number of specific 

 and continuous forces to produce them; spe- 

 cific and accurate beyond the operations of 

 any mere secondary force. Now there is not 

 the least symptom of the presence of any 

 forces at all, and they would have no fitness 

 or application for any such purpose. Nothing 

 but one single force pushing the moon exactly 

 as it moves in its remarkable course would 

 apply at all. Just as a man may push a 

 wheel-barrow before him. In that case we 

 have both the wheel-barrow and the man be- 

 hind it. But in the case of the moon, there is 

 not even a trail behind it.. 



Now there is only one plausible view of the 

 moon's motion, and that is unmistakably self- 



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