12 PROFESSOR HENRY AND THE 



covered by Henry in 1828, and which Faraday 

 used in making his discovery.* No publica- 

 tion referring to this paper had reached this 

 country till April, 1832, when a vague reference, 

 made to it in the "Annals of Philosophy," was seen 

 by Henry, which led to his publication of July, in 

 " Sillimari's Journal" where he gave a full ac- 

 count of this great discovery, made by himself 

 before he heard of Faraday's work, which, when 

 compared with Faraday's paper of November, 

 exhibits Faraday's experiment for solving the 

 problem. When he wrote his paper, Henry, 

 mislead by the imperfect statement in the 

 " Annals of Philosophy " supposed that his experi- 

 ment had differed from Faraday's, but was un- 

 deceived when the full publication reached him. 

 In 1831, a teacher in the Albany Academy was 

 very remote from London, and the Eoyal Society. 



In that same year, and in the same few weeks, 

 Faraday first, and Henry after him, independently 

 made the discovery of magneto -electricity; "the 

 " greatest experimental result ever obtained by 

 " an investigator," in the opinion of Tyndall.f 



In the same field, and during the same years, 

 were the other great scientists of the world, study- 

 ing the same subject : Ampere, Arago, Oersted, 

 Davy, and a host of others; but these two did it, and 



* See Appendix, Note B. 

 t See Appendix, Note C. 



