ADVERTISEMENTS, 
5 
NATURAL HISTORY AGENCY OFFICES. 
MR. G. S. SOWERBY has removed the above from the Strand 
to his private residence (at Mr. Weiss), 32, GREAT RUSSELL STREET, 
BLOOMSBURY. G. B. S. sells ou 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 slidls for sdilo 
The ILLUSTRATED INDEX OF BRITISH SHELLS, coloured, at 30s., con- 
tains figures of all the recognized species. The Thesaurus conchyliorum, pi. 19, 
contains Ancillavia and other genera. A liberal discount ou personal application 
to No. 32, GREAT RUSSELL STREET, BLOOMSBURY. 
ISLE OF WIGHT FOSSILS. 
H KEEPING can fnraish 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, lists of which can be sent on application. 
The specimens are all collected by himself, and are kept carefully separate. 
Satisfactoiy references can be given to several weU-knovvn Geologists by whom 
he has been employed during many years. 
H. K. also acts as guide to the different geological localities. 
Stroud Place, Fkkshwater, Isle of Wight. 
FOSSILS AND MINEEALS. 
JAMES R. GREGORY has for Sale large Collections of the above, 
as single specimens, or in collections, or as series from the vai-ious forma- 
tions, etc., at very reasonable prices. 
Collections of Minerals in French-polished mahogany cabinets containing — 
4 drawers . . . 120 specimens ... £3 3 0 
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 illus- 
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 frag- 
ments 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 Hihernica, several of them in a state of fructification, 
from the Devonian of Ireland ; very fine specimens of Pterichlhys, from Gamrie ; 
HoloptycMi, 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 Minei-alojrical specimens. 
Lists of species of the Devonian fishes with prices, and lists 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, 
