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more transcendental than are our modern theories 

 on matter, on inertia, on the ether, or on the 

 origin of life, but that metaphysics by "intercala- 

 tion of facts" shall become physics, that, in the 

 words of Descartes, concepts, if " pera ra faa-i/cd," 

 "talia sint tantum ut omnibus naturae pheenomenis 

 accurate respondeant," and that notions great and 

 small shall be subjected to strict verification, so far 

 as such tests can be carried; not that men shall 

 deny themselves the rapture of touching that 

 various instrument they find within themselves, 

 but that they shall endure the drudgery of 

 learning to play it in harmony with the orchestra 

 of nature ; not that they shall desist from imagin- 

 ing, but that before proclaiming hypotheses they 

 shall be compelled to the humble task of making 

 an infinite number of little piles of facts. The art 

 of experiment can grow only with the growth 

 of science itself ; instruments of precision are not 

 provided till men feel the need of them. The 

 experimental verification of concepts is no mere 

 alternative path, no mere renunciation, but a new 

 birth ; a birth into a dull and vexatious discipline 

 for the impatient Hegelian, whether of the thirteenth 

 or of the twentieth century, who believes that, as 

 mind is the product of evolution, and so the sum 



