ADVERTISEMENTS. 
5 
NATURAL HISTORY AGENCY OFFICES. 
MR. G. B. SOWERBY has removed the above from the Strand to his private 
residence (at Mr. Weiss), 32, GREAT RUSSBLL-STREET, BLOOMS- 
BURY. G. B. S. sells on commission, prepares for auction, conducts exchanges 
of shells, minerals, fossils, books, names and arranges collections of shells, &c. 
He has at present on hand some very fine reserves from collections of shells for 
The ILLUSTRATED INDEX OF BRITISH SHELLS, coloured, at 30s., 
contains figures of all the recognized species. The Thesaurus conchyliorum, 
pi. 19, contains Ancillaria and other genera. A liberal discount on personal 
appUcation to No. 32, GREAT RUSSELL-STREET, BLOOMSBURY. 
ISLE OF WIGHT FOSSILS. 
H KEEPING can furnish small or large Collections of FOSSILS from the 
. Hempstead, Bembridge, and Headon Series, and Barton Clay of the Isle 
of Wight, Bracklesham Sands of Bramshaw, and Barton Clay of Barton, at Id. 
and upwards per specimen, Ksts of which can be sent on application. 
The specimens are all collected by himself, and are kept carefully separate. 
Satisfactory references can be given to several well-known Geologists by whom 
he has been employed during many years. 
H. K. also acts as a guide to the different geological localities. 
Steoud Place, Freshwatek, Isle of Wight. 
FOSSILS AND MINERALS. 
JAMES R. GREGORY has for Sale large Collections of the above, as single 
specimens, or in collections, or as series from the various formations, etc., at 
very reasonable prices. 
Collections of Minerals in French-polished maliogany cabinets containing — 
4 drawers . . . 120 specimens . . .£330 
6 do. . . . 200 do. . . . 5 5 0 
8 larger do. . .400 do. . . . 12 12 0 
These specimens are all of the most select description, and characteristic of each 
species ; they are arranged according to Dana's system of Mineralogy, and iUns- 
trate all the recent works on the science. 
These collections can be arranged entirely with British Minerals if preferred, 
otherwise they consist of specimens from all parts of the globe. 
Fragments of minerals for analysis by blowpipe, etc., in collections of 300 spe- 
cimens in boxes, price 18s., or in single series of 50 at 3s., also 40 larger fragments 
of rare or new minerals, 10s. 
Rare minerals and earths for chemical purposes, manufactures, etc. ; crystals of 
diamonds, and all the varieties of precious stones, in collections, etc. 
The Fossils include a very fine collection of Scottish Old Red Sandstone fishes, 
together with numbers from other formations, especially fishes. These can be 
had in collections, or as single specimens. Several important specimens may be 
mentioned, viz., Cyclopteris Hibernica, several of them in a state of fructification, 
from the Devonian of Ireland ; very fine specimens of Ptericlithys, from Gamrie ; 
Holoptychii, from Dura Den, etc. Some of these are well adapted for musems. 
Scientific Books, Maps, Charts, Cabinets, Glass-capped Boxes, Hammers, and 
all kinds of apparatus necessary for the collection and arrangement of Geological 
and Mineralogical specimens. 
Lists of species of the Devonian fishes with prices, and Ksts of the contents of 
collections of fragments of minerals can be had on application to 
J. R. GREGORY, 
MINERALOGIST. 
3, KING WILLIAM-STREET, STRAND, LONDON, W.C. 
