96 Mr Christie on the Developement 



being, in my experiments, observed after rotation, and in his, 

 during its continuance. He afterwards mentioned to me, that 

 a polarising of the shell at right angles to the axis, would ac- 

 count for the phenomena he had observed ; when I stated to 

 him, that this was precisely the species of polarisation which, 

 J had so long since informed him, would account for all the 

 phenomena I had observed as due to the rotation of an iron 

 plate. As Mr Barlow, notwithstanding this, was disposed to 

 assign an origin to his experiments totally distinct from mine, 

 neither " good fellowship, nor the interests of science," re- 

 quired that I should not include experiments on the rapid ro- 

 tation of an iron plate in my paper. I, however, did not in- 

 clude them. My paper was given to Mr Herschel, in its 

 original form, on the 20th of April ; and on the 25th of April, 

 I commenced a series of experiments, to ascertain myself, 

 whether the effects produced during the rotation of iron are 

 distinct from those observed after the rotation has ceased. 

 This series was concluded on the 29th of April ; and some 

 time after, when I considered that both Mr Barlow's paper 

 and my own had been read before the Royal Society, and 

 when, in fact, I believe they had, I sent an account of these 

 experiments as a supplement to my paper.* So that Mr Bar- 

 low, however unintentionally, is incorrect in stating that it 

 was in the interval between making the arrangement, that my 

 paper should be the first presented, and the reading of the 

 papers, that this supplement was added to mine, -f- As I sup- 

 posed that Mr Barlow's had been read, which it had, I cer- 

 tainly did not consider it was necessary that I should formally 

 notice his experiments, more especially as I was aware that 

 Mr Barlow did not allow he had been led to his results by 

 those which I had previously obtained, although he had been 

 in possession of the general facts three years previously. 



As the magnetical effects produced by rotation at this time 

 engaged a good deal of attention, on sending you in May 



* Mr Barlow's paper was read on the 5th May, mine on the 12th May, 

 and I have reason to think, that this account was sent after the 15th 

 May. 



"fr That this arrangement was not adhered to, appears from the date of 

 the reading of the papers. 



