﻿302 Notices respecting New Books, 



gence. On again charging the magnet another portion of filings 

 was thrown off; and the writer in this way succeeded in collecting 

 in front of the magnet about one-twentieth part of the filings 

 employed, after which he was unable further to separate them 

 than by increasing the divergence of the iron filaments on the 

 magnetic poles each time the arrangement was charged. 



The filings were removed, and the test-needle brought over 

 the magnet so that the point was drawn downwards to an 

 angle of 60° in its endeavour to attain contact with the opposing 

 pole, but was not allowed quite to reach it. The magnet was 

 then charged as before ; and at once the needle began to with- 

 draw itself, the point becoming charged with positive, the head 

 with negative electricity ; a conductor was presented to it ; it 

 discharged itself aud returned towards the magnet, and could 

 have been kept in this state of oscillation indefinitely. When 

 the magnet was discharged, the needle at once flew back to its 

 former position ; left to itself, the point by degrees discharged 

 itself into the air and returned to the magnet. 



Two needles just touching the poles of the magnet, in the 

 arrangement above described, could not be repelled; but when 

 the magnet was charged, their free ends took a much greater 

 degree of divergence than they previously had. 



Albemarle Street. 



[To be continued.] 



XLI. Notices respecting New Books. 



Introduction to the Study of Inorganic Chemistry. By William 

 Allen Miller, M.D., D.C.L., LL.B., $c. London : Longmans. 

 8vo. Pp. xi and 288. 



A Cyclopcedia of Quantitative Chemical Analysis. By Frank H. 

 Storer, A.M., Professor of General and Analytical Chemistry in 

 the Massachusetts Institute of Technology. — Part I. Boston and 

 Cambridge (U.S.) : Sever. London : Spon. Large 8vo. Pp. iv, 

 112 and 8. 



Handbook of the Metals. By Thomas Allen Blyth, M.A., Ph.B., 

 F.E.I.S., F.G.S.E., University of Cotting en. London: Longmans. 

 Small 8vo. Pp. ii and 128. 



HPHE Messrs. Longmans are issuing a series of elementary works 

 -*- on various branches of mechanical and physical science. These 

 are intended for general use in schools, and for the self-instruction 

 of working men ; to both of which purposes their uniformly low 

 price and moderate amount of matter are decidedly appropriate. The 

 late Dr. Miller, having undertaken the authorship of a chemical text- 

 book for this series, had completed his task and was engaged in read- 

 ing the proof-sheets, when he was seized with an illness which un- 

 happily proved fatal. His friend Mr. C. Tomlinson, F.R.S., to whom 



