PAKT I. 



EXTRACTS 



FROM 



UNPUBLISHED MANUSCBIPTS 



EDITED BY 



EALPH ALLEN SAMPSON, M.A., F.R.A.S., 



PROFESSOR OF MATHEMATICS IN THE UNIVERSITY OF DURHAM. 



PAKT II. 

 TEBKESTBIAL MAGNETISM 



EDITED BY 



WILLIAM GRYLLS ADAMS, Sc.D., F.R.S., 



PROFESSOR OF NATURAL PHILOSOPHY IN KING'S COLLEGE, LONDON. 



