ADVERTISEMENTS. 
7 
NATURAL HISTORY AGENCY OFFICES. 
MR. G. B. SOWEKBY 1ms removed the above from the Strand 
to his private residence (at Mr. Weiss), 32, GREAT RUSSELL-STREliT, 
BLOOMSBURY. G. B. S. sells ou uommission, prepares i'ur 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 sale. 
The ILLUSTRATED INDEX OF BRITISH SHELLS, coloured, at 30s., contains 
figures of all the recognised species. The Thesaurus conchyliorum, pi. 19, contains 
Ancillaria and other genera. A liberal discount on personal application to No. 32, 
GREAT RUSSELL-STREET, BLOOMSBURY. 
ISLE OF WIGHT FOSSILS. 
XT KEEPING can furnish small or large Collections of FOSSILS 
from the Hemp.stead, Bembridge, and Headon Scries, and Bax'ton Clay of the 
Isle of Wight, Bracklesham Sands of Bramshaw, and Barton Clay of Barton, at Id. 
and upwards per specimen, lists of which can be sent on application. 
The specimens are all collected by himself, and are kept carefully sepai-ate. 
Satisfactory references can be given to several well-known Geologists by whom he has 
been employed during many years. 
H. K. also acts as guide to the different geological localities. 
SiKonD Place, Freshwater, Isle op 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 mahogany cabinets containing — 
4 drawers . . .120 specimens . . .£330 
6 do. . . . 200 do. . ..550 
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 illustrate 
all the recent works on the science. 
These collections can be arranged entii'ely with British Minerals if preferred, other- 
wise they consist of specimens from all parts of the globe. 
Fragments of minerals for analysis by blowpipe, etc., in collections of 300 speci- 
mens in boxes, price 18s., or in single series of 50 at 3s., also 40 larger fragments of 
rare or new mineials, 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. : Cyclopleris Hibernica, several of them in a state of fructification, from the 
Devonian of Ireland ; very fine specimens of Pterichthys, from Gamrie ; Holoptychii, 
from Dura Den, etc. Some of these are well adapted for museums. 
Scientific Books, Maps, Charts, Cabinets, Glass-capped Boxes, Hammers, and all 
kinds of apparatus necessary for the collection and arrangement of Geological and 
Miueralogical specimens. 
Lists of species of the Devonian fishes with prices, and lists of the contents of 
collections of fi'agments of minerals can be had on application to 
J. K. GEEGOKY, 
MINERALOGIST, 
3, KING WILLIAM-STREET, STRAND, LONDON, W.C. 
