EDWARD PATERSON, 
philosophical instrument maker, and 
electrical engineer, 
76 LITTLE BRITAIN, ALDERSGATE STREET, 
’ ( Late 3, Bedford Court , Covent Garden). 
t »e-; ssz u a rr;r,xss 
bv the Science and Art Department, South Kensington. 
Illustrated Catalogue, Part i, Eleftrical Apparatus, post free, 6d. 
Part 2, Ele&ric Signals, „ oa - 
Part 3, Apparatus for Hire for 
” ” Scientific Lectures. „ 2d. 
Now Ready, Crown 8vo„ Price 7s. 6d. 
THE CONSTITUTION OF THE EARTH: 
BEING AN INTERPRETATION 0F the laws of god in nature 
by which the earth and its organic life 
have been derived from the sun by 
A PROGRESSIVE DEVELOPMENT. 
By ROBERT WARD. 
London: GEO. BELL and SONS, York Street. 
Fcp. 8vo., Cloth, Price 5s. 
SPIRIT GRAVITIES. 
By THOMAS STEVENSON, M.D. 
OF 
This work is specially adapted for the use of Public Analysts and others 
engaged in the analysis of alcoholi c liquids. 
JOHN VAN VOORST, i, Paternoster Row. 
HO - A — CHBEEINTS , 
prater, Statural anir Sritnfifo gtangtfm 
q, ESSEX STREET, STRAND, W.C. 
. „ ’ rt . thi „ an d other Philosophical Periodicals, Mr. Cheffins begs 
As Engraver to this and o oossesses every appliance for the produc- 
,0 call a. tent, on to the fa& as well as special 
1 ‘" S the ' absolutely accurate reproduflion of Diagrams, Microscopic 
Objea“&c., by Photography cn Wood; by which process they can be either 
enlarged or reduced ; . provided to attend Leftures and Demonstrations, 
_KHS3? 
s^==fisrs'st5 
Hill, London , B.C. 
