A TREATISE 



ON 



MAGNETISM 



for tije use of jetutients in tl)c 



BY 



GEORGE BIDDELL AIRY, M.A. LL.D. D.C.L. 



FORMERLY FELLOW, NOW HONORARY FELLOW, OF TRINITY COLLEGE; 



LATE LUCASIAN PROFESSOR OF MATHEMATICS, AFTERWARDS PLUMIAN PROFESSOR 



OF ASTRONOMY AND EXPERIMENTAL PHILOSOPHY, 



IN THE UNIVERSITY OF CAMBRIDGE ; 



ASTRONOMER ROYAL. 



MACMILLAN AND CO. 



1870. 



[All Rights reserved.} 



