Faraday. 221 



permit the exertion of the magnetic force with more facility in 

 one direction than another ; and that direction would be the 

 magnecrystallic axis. Hence, when in the magnetic field, the 

 magnecrystallic axis would be urged into a position coincident 

 with the magnetic axis, by a force correspondent to that 

 difference, just as if two different bodies were taken, when the 

 one with the greater conducting power displaces that which is 

 weaker." 



This hypothesis led Faraday to predict the existence of 

 another type of magnecrystallic effect, as yet unobserved. " If 

 such a view were correct/' he wrote,* " it would appear to 

 follow that a diamagnetic body like bismuth ought to be less 

 diamagnetic when its magnecrystallic axis is parallel to the 

 magnetic axis than when it is perpendicular to it. In the two 

 positions it should be equivalent to two substances having 

 different conducting powers for magnetism, and therefore if 

 submitted to the differential balance ought to present 

 differential phaenomena." This expectation was realized when 

 the matter was subjected to the test of experiment. f 



The series of Faraday's " Experimental Researches in 

 Electricity " end in the year 1855. The closing period of his 

 life was quietly spent at Hampton Court, in a house placed at 

 his disposal by the kindness of the Queen ; and here on August 

 25th, 1867, he passed away. 



Among experimental philosophers Faraday holds by uni- 

 versal consent the foremost place. The memoirs in which his 

 discoveries are enshrined will never cease to be read with 

 admiration and delight; and future generations will preserve 

 with an affection not less enduring the personal records and 

 familiar letters, which recall the memory of his humble and 

 unselfish spirit. 



*Exp. Res., 2839. ^ Ibid., 2841. 



