ADVERTISEMENTS. 
NATURAL KISTOKT ASENCT OFFICES. 
MR. G. B. SOWERBY has remoVetl thp above from the Strand 
to his imvate residence (at Mr. AVeiss), 32, GREAT RUSSELI^STREET, 
BLOOMSBURY. G. B. S. .sells on coinniission, prejwrcs for auction, conducts 
e.\.cliangcs of shells, minerals, fossils, books, n:inies and anangcs collections of 
slu'lls, &c. He has at present on hand sonic very tine reserves from collections of 
shells for sale. 
The ILLUSTRATED INDEX OF BRITISH SHELLS, coloured, at 30;?., 
contiins ligures of all the recognised sjiecies. The Thesaunis conchylionim, pi. 19, 
contains Ancillavin and other genera. A liberal discount on ]jersonal application 
to No. 32, GJiEAT RUSSELL-STREET, BLOOMSBURY. 
ISLE OF WIGHT FOSSILS. 
XT KEP^PING can furnish small or large Collections of FOSSILS 
fro'ji the ncmpstcad, Benibridge, and Headon Scries, and Barton Clay of the 
Isle of Wight, Brackleshani Sands of Branishaw, and Barton Clay of Baiton, at Id. 
and upwards per sjiecimen, lists of which can be sent on application. 
The spt'ciniens arc all collected by himself, and are kept carefully separate. 
Satisfactory refcrcticcs can be given to several well-known Geologists by whom he 
lias been cin])ioyc(l during many years. 
H. K. also acts as a guide to the tlitlerent geological localities. 
Stroud Place, EitESH'WA'TER, Isle of Wight. 
FOSSILS AND MINERALS. 
TAMES R. GREGORY has for Sale large Collections of the above, 
" as single specimens, or in collections, or as scries from the various formations, 
etc., at very reasonable j)i-ices. 
^Collections of Minerals in French-polished mahogany cabinets containing — 
4 drawers . . < 1'20 specimens . . . X3 3 0 
6 do. ... 200 do. . . . _ 5 ,5 0 
8 larger do. . . 400 do. . . . "12 12 0 
These s])eciniciis are all of the most select description, and charactciT.»tic of each 
species; they arc arranged according to Dana's system of Mineralogy, and illustrate 
all the recent works on the science. 
TIkl'sc collections can be airanged entirely with British Minerals if preferred, 
otherwise they consist of specimens from all parts of the globe. 
Fragments of minerals for analysts by blowpij)C, etc., in collections of 300 spcci- 
jnens in boxes, ])rice 18.v., or in single series of 30 at 3*., also 40 larger fragments of 
rare or new minerals, lOv. 
Rare minerals and eartlis for chemical purposes, manufactures, etc. ; crj-stals of 
diamonds, and all the varieties of j)recions stones, in collections, etc. 
The Fossils include a very fine collection of Scottish Old Red Sandstone fishes, 
together witli mimbers fi'oui other formations, esix?cially fishes. These can be had in 
coilcctions, or as single specimens: several importiint specimens may be mentioned, 
viz.: Cyclcpteris Hihernica, several of thein in a state of fructification, from the 
Devonian of Ireland; \ny fine .specimens of I'terwhtliys, from Ganuie; Hvloptychii, 
from Dura Den, etc. Home of these arc well adapted for museums. 
Scientific Books, J laps, Chart*;, Cabinets, Glass-capjicd Boxes, Hammers, and all 
kinds of apparatus neccssaiy for the collection and arrangement of Geological and 
Mineralogit-al specimens;. 
Lists of species of the Devonian fishes with prices, and lists of the contents of 
collectious of fragments of miucnils can be had on apjilication to 
J. R. GREGORY, 
MINERALOGIST, 
3, KING WILLIAM-STREET, STKAND, LONDON, W.C. 
