The Fundamental Principles of Scientific Inquiry. 397 



As v tends to c, k tends to infinity, yu 2 is finite, and, except 

 in the case of a beam passing through the centre of the sun, 



, , is finite. It follows that the ratio (k/h) must remain 

 dip 



finite, and the above equation reduces to 



\d<b) 



+ 7W 2 



University of Queensland, H. J. PRIESTLEY 



Brisbane, 

 August 5th, 1921. 



XL1II. The Fundamental Principles of Scientific Inquiry. 



To the Editors of the Philosophical Magazine. 



Gentlemen, — 



ON p. 373 of the September number of the ' Philosophical 

 Magazine ' Drs. Wrinch and Jeffreys accuse me of 

 having stated in my ' Physics ' that " only those processes, 

 logical and experimental, are admissible in physics, which 

 are universally agreed to be valid." On pp. 21-22 o£ that 

 book I intended expressly to disclaim that interpretation of 

 my views, and used against it much the same arguments that 

 Drs. Wrinch and Jeffreys have used. The passage concludes 

 thus : — u The view that I wish to assert is ... . that science 

 starts by selecting for its consideration those judgements 

 alone concerning which absolutely universal agreement can 

 be obtained, rejecting unhesitatingly any concerning which 

 there can be any doubt or personal opinion ; that at every 

 stage of the reasoning to which it submits these judgements 

 a personal element is introduced, and with it the possibility of 

 error and of difference of opinion ; and that its final results, 

 those that represent its greatest achievements and possess the 

 greatest intellectual value, are almost as individual and as 

 personal as the greatest achievements of art." 



Drs. Wrinch and Jeffreys probably think that nonsense ; 

 but it is not the nonsense that they have imputed to me. 



Yours faithfully, 

 Nov. 6th, 1921. Norman R. Campbell. 



