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ADVERTISEMENTS. 
Now ready, Second and Cheap Edition of 
TUILLY'S BOOK OF BIRDS. In Ornamental pasteboard 
' • Covers, witli 10 plates, coloured by liaud. Price '6s. Gd. 
The Original Editio.n, with 16 Coloured Plates, handsomely bound in cloth and gold, can 
be obtained at the " Geologist" Office, 15(5, Strand, or through all Booksellers. 
lu the Press, price to Subscribers, 5s. 
'T'HB CHALK CLIFFS OF DOVER; A Geological and Paltcon- 
-L tological Description of the typical section of the English Upper Cretaceous 
beds.— By S. J. Mackie, F.G.S., F.S.A. 
Of the beautiful and instructive section of the Chalk Strata at Dover, there 
exists no other description than the original and admirable paper by William 
Phillips in the Geological Transactions of 1818. The author's long and intimate 
acquaintance with this locality gives him peculiar facilities for presenting in a 
light and readable form a concise aud accurate account of the White Cliffs of this 
celebrated shore, and which he trusts will be thought worthy of being regai-ded 
as a text-book generally for the chalk-districts of England. 
The proposed work will be illustrated by first-class woodcuts, and will be issued 
to Subscribers at the price of Five Shillings. Subscriptions will be received by 
the Author, 166, Strand. 
London : J. Van Vookst, Paternoster Eow. 
ADDITIONAL SUBSCRIBEK'S NAME RECEIVED: 
Dr. HOLL, St. George's Square, Pimlico, S.W. 
A few Copies will be Printed on Tinted Paper, and Bound in Supenor Style, at 10s. Cd. 
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Now Published, crovm 8vo, cloth, illustrated, price 5s. 
IRST TRACES OF LIFE ON THE EARTH ; on, THE 
FOSSILS OF THE BOTTOM HOCKS. By S. J. Mackie, F.G.S., F.S.A. 
London : Groom BBiDaE & Sons, 5, Paternoster-row. 
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A 
LARGE COLLECTION OF LIAS AND OTHER FOSSILS, 
from the Yorkshire Coast, for Sale . 
Single specimens may also be had at moderate Prices. 
Apply to A. LANGTON, "Geologist" Office, 156, Strand. 
TMPROVED ACHROMATIC MICROSCOPES for Students, 
J. From £B 3 0 
Society of Arts' Microscope . . . . • . 3 3 0 
Botanical Microscopes, with compound powers, fitted in mahogany cases, from 6s. 6d. 
and upwards. 
Stanhope and Codington Lenses, Thin Glass Circles and Squares, Plain Glasses, 
Rings, aud Cells of every description, for mounting microscopic objects. Improved 
Frog Plates and Live Boxes. 
At John Warnek's Photographic and Philosophical Instrument Manufactory, 72, 
Fleet-street, London, E.C. 
