A PHYSICAL TREATISE 
ON 
ELECTRICITY AND MAGNETISM. 
By J. E. H. GORDON, B.A., 
Author of “ Four LeAures on Static Eledric Induftion,” and Assistant Secretary 
to the British Association. 
2 vols., demy 8vo., cloth extra, 36s. {Now ready. 
London: SAMPSON LOW, MARSTON, SEARLE, AND RIV 1 NGTON, 
Crown Buildings, 188, Fleet Street, E.C. _____ 
Just Published, 
THE BRAIN AS AN ORGAN OF MIND. 
By H. CHARLTON B ASTI AN, M.D. 
With numerous Illustrations, Crown 8vo., cloth, Price Five Shillings. 
%* Volume XXIX. of the INTERNATIONAL SCIENTIFIC SERIES. 
London : C. KEGAN PAUL & CO., i, Paternoster Square. 
IR,. _A~ CHEPFITTS, 
Dtooj) Gnjjnttor, pt|anirai an* Scientific gran#$nran, 
9 , ESSEX STREET, STRAND, W.C. 
As Engraver to this and other Philosophical Periodicals, Mr. Cheffins begs 
to call atfentfon to the fad that he possesses every appliance for the produc- 
fnn A Illustrations to the works of Scientific Authors, as well as special 
i “ivLfnr the absolutely accurate reprodudion of Diagrams, Microscopic 
O^e'as! “ Photography on Wood f by which process they can be either 
^Experi^nc^if draughtsmen provided to attend Leftures and Demonstrations, 
and to Sketch Mechl nical and other objefts at a few hours notice. 
edward^aterson^ 
philosophical instrument maker, and 
electrical engineer, 
76 LITTLE BRITAIN, ALDERSGATE STREET, 
’ ( Late 3, Bedford Court , Covent Garden). 
Proffssor Crookes’s Radiant Matter Tubes; Apparatus for Science 
Teachers a^d Schools and Colleges; Apparatus of all sorts as recommended 
by the Science and Art Department, South Kensington. 
Illustrated Catalogue, Part 1, Electrical Apparatus, post free, 6d. 
Part 2, Ele&ric Signals, » 6d. 
” ” Part 3, Apparatus for Hire for 
” ** Scientific Lectures. „ 2d. 
Hill , London , E.C. 
