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 RUSSELL-STRBET, 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. 
II o 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 recognized species. The Thesaurus conchyliornm, 
pi. 19, contains AnciUaria and other genera. A liberal discount on personal 
application to No. 32, GREAT RUSSELL-STREET, BLOOMSBURY. 
ISLE OF WIGHT FOSSILS. 
H KEEPING can famish smaU or large Collections 6f FOSSILS from the 
• Hempstead, Bembridge, and Headon Series, and Barton Clay of the Isle 
of Wight, Bracklcsham 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. 
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 diflFerent geological localities. 
Steoud Place, Freshwater, Isle of Wight. 
FOSSILS, MINERALS, AND ROCKS. 
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. 
British rocks in collections of 100 to 200 specimens from various parts of the 
British isles, stratigraphicaUy arranged from all formations, with name and 
locality. These are all clean and fresh-broken specimens, all of the same size in 
each collection, so as to be arranged neatly and without waste of room in 
cabiucts, &c. 
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 consist of a large and fine collection, all the British strata from the 
Pleistocene to Cambrian, including fine specimens of fishes from the Devonian, 
Lias, Carboniferous, and Oolitic series. Also fine museum specimens of Cyclop- 
tens Hibernica, Holoptychius, Coccosteus, Turtles, and various other intcresticg 
fossils, which may be obtained in collections, or as single specimens. 
Small or large collections can be arranged to order, for which estimates can be 
torwarded. 
Scientifi': Books, Maps, Charts, Cabinets, Glass-capped Boxes, Hammers, and 
all kinds of appsiratus necessary for the collection and arrangement of Geological 
and Mineralogical specimens. 
Lists of species of the Devonian fishes with prices, and lists of the contents of 
coUections of fragments of minerals can be had on application to 
J. R. GREGORY, 
MINERALOGIST. 
3, KING WILLLiM-STREET, STRAND, LONDON, W.C. 
