EDWARD PATERSON, 
philosophical instrument maker, and 
electrical engineer, 
76 LITTLE BRITAIN, ALDERSGATE STREET, 
(Late 3, Bedford Court, Covent Garden). 
Professor Crookes’s Radiant Matter Tubes; Apparatus for Science 
Teachers and Schools and Colleges; Apparatus of all sorts as recommended 
by the Science and Art Department, South Kensington. 
Illustrated Catalogue, Part r, Eleflrical Apparatus, post free, 6d. 
Part 2, Eledtric Signals, »» 0 Q • 
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Scientific Ledtures. ,, 2d. 
Now Ready, Crown 8vo., Price 7s. 6d. 
THE CONSTITUTION OF THE EARTH: 
BEING AN INTERPRETATION ©f 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. 
FELLOW AND EXAMINER IN CHEMISTRY TO ™ ^°“ E ° F 
Physicians ; Lecturer on Chemistry at Guy s Hospital. 
This work is specially adapted for the use of Public Analysts and others 
engaged in the analysis of alcoholic li quids. 
JOHN VAN VOORST, i, Paternoster Row. 
:r, .a.. ohbffints, 
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9, ESSEX STREET, STRAND, W.C. 
^ . ru’c onri nthpr Philosophical Periodicals, Mr. Cheffins begs 
As Engraver to thl ® an f ^°,^ t h e possesses every appliance for the produc- 
to call attention to the fadt that .^ n ^ as well as special 
tion of I J lus . t ^ atl0 {J® lately 6 accurate reproduction of Diagrams, Microscopic 
ObjeSs!^'., by Photography on Wood ; by which process they can be either 
en H rge fi. 0 n«d d D C ra d ughtsmen provided to attend Leftures and Demonstrations, 
Hill , London , E.C. 
