ADVERTISEMENHP. 
6 
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-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. 
lie has at present on hand some very fine reserves from collections of shells for 
sale. 
The ILLUSTRATED INDEX OP BRITISH SHELLS, coloured, at 30s., 
contains figures of all the recognized species. The Thesauras conchyUorum, 
pi. 19, contains Ancillaria and other genera. A Uberal discoimt on personal 
application to No. 32, GREAT RUSSELL-STREET, BLOOMSBURY. 
ISLE OF WIGHT FOSSILS. 
H KEEPING can furnish small or large CoUectiona 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, hsts of which can be sent on apphcation. 
The specimens are all collected by himself, and are kept careftdly separate. 
Satisfactory references can be given to several well-known Geologists by whom 
he has been employed dviring many years. 
H. K. also acts as a guide to the different geological localities. 
Steoud Place, Freshwater, Isle of Wight. 
FOSSILS, MINERALS, AND ROCKS. 
JAMES R. GREGORY has for Sale large CoUectiona 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 aU formations, with name and 
locahty. 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 
cabinets, &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 Oohtic series. Also fine musevim specimens of Cyclop- 
teiis Hibemioa, Holoptychius, Coccosteus, Turtles, and vaiious other interesting 
fossils, which may be obtained in collections, or as single specimens. 
Small or largo collections can be arranged to order, for which estimates can be 
torwarded. 
Scientific Books, Maps, Charts, Cabinets, Glass-capped Boxes, Hammers, and 
aU kinds of apparatus necessary for the coUection 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 WILLIAM-STREET, STRAND, LONDON, W.C. 
