ACG. U, 1885.] 



♦ KNOWLEDGE ♦ 



Infinity of the argument used first by Aristotle and 

 (juoted as " unanswerable but utterly unconvincing " by 

 8ir John Herschel. Said Aristotle, Since whatever two 

 points you take in space the line joining them is finite, 

 space must be finite. I pointed out that the answer to 

 this, which is in efi'ect Euclid's first postulate, is found 

 in the second. Any one of Aristotle's finite lines can be 

 produced to any distance in the same straight line. This 

 necessarily implies infinity; for it is only another 

 way of saying that no line can be regarded as absolutely 

 finite, seeing that every finite line can be extended. 



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tator criticised — justly as he supposes — in the Saturday 

 Review. In reality, I wrote an article in the Comhill 

 Marjazine discussing Herr Marth's opinion that the comet 

 of 1880 might return in 1897, and perhaps work mischief. 

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I had defended and emphasised in a later article which 

 appeared some time before the article in the Spectator, 

 wherein some one (the editor, I believe) attributed Hen- 

 Marth's prediction to me, and showed that he had 

 otherwise misunderstood me. 



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