2 
ADVERTISEMENTS. 
Now ready. 
CIR RODERICK MURCHISON'S NEW GEOLOGICAL 
^ SKETCH MAP OF SCOTLAND. This Map, containing the recent most 
important groupings of the Scotch Rocks by Sir Roderick Morohison, is, under 
his authority, now puhlished a,t the " Geoloqist" Office, 156, Strand, accompanied 
by the Exi'lanation op the Details. 
Loiuloa : " Geologist" Office, 156, Strand, and through all Booksellers. 
Now ready, Second and Cheap Edition of 
WILLY'S BOOK OF BIRDS. In Ornamental pasteboard 
Covers, with 10 plates, coloured by hand. Price 3s. 6d. 
A few copies of the Origikal Editiox, with 16 Coloured Plates, handsomely bound in cloth 
and gold, are still on hand, and can be obtained at the "Geologist" Office, 156, Strand, or 
through all Booksellers. 
PRACTICAL GEOLOGY. — King's College, London. — Professor 
Tennant, F.G.S., will give a Course of TWELVE LECTURES on GEOLOGY, 
having especial reference to the application of the Science to Engineering, Mining, 
Architecture, and Agriculture. The Lectures commenced on Friday Morning, 
April 20th, at Nine o'clock. They will be continued every Wednesday and Friday, at 
the same hour. Fee, ^1 lis. 6d. 
R. W. JELF, D.D., Principal. 
TMPROVED ACHROMATIC MICROSCOPES for Students, 
-L From £3 3 0 
Society of Arts' Microscope . . . . -.330 
Botanical Microscopes, with compound powers, fitted in mahogany cases, from 6s. Gd. 
and upwards. 
Stanhope and Codington Lenses, Thin Glass Circles and Squares, Plain Glasses, 
Rings, and Cells of every description, for mounting microscopic objects. Improved 
Frog Plates and Live Boxes. 
At John Warner's Photographic and Philosophical Instrument Manufactory, 72, 
Fleet-street, London, E.C. 
COWERBY, CONCHOLOGIST AND PUBLISHER. Estab- 
^ lished 50 years ; from opposite the British Museum. Having the largest and finest 
Stock of Minerals, Fossils, and Shells, they can be offered at prices lower than any 
other establishment in the world. 
The Geological, Mineral, and other Collections, having every specimen with the 
scientific name attached, and being systematically arranged, afford the greatest facility 
to students. 
CABINETS. 
Mahogany Cabinets are made to any size, of the best seasoned woods, which have 
been stacked for many years. 
A 4-drawer mahogany French-polished Cabinet, enclosed by 
folding doors, lock and key . . . . , . £0 17 6 
A 5-drawer larger ditto ditto ditto . ..110 
A 6-drawer ditto ditto ditto . .17 0 
A 7-drawer ditto ditto ditto . . . 1 17 0 
An 8-drawer ditto ditto ditto . .2100 
SowERBT, 167, Strand, London, W.C. 
