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The Geologignl Magazine Advertiser, 
JAMES TENNANT, Mineralogist (by appointment) to Her Majesty 
and the Baroness Burdett-Coutts, 149, Strand, London, W.C. 
Has received a quantity of Diamonds from South Africa. Collectors can be supplied with small 
crystals from five shillings each and upwards, He has also some fine Diamonds from the Cape, 
which have been cut and polished in London, 
I. TREATISE on DIAMONDS and PEARLS, with Ten Plates showing size of Brilliant and Rose 
Diamonds from 1 to 100 carats, in which their importance is considered, and plain rules are exhibited 
for ascertaining the value of both, and the method of cutting and polishing diamonds. By Davip 
Jerrries, Jeweller. First published in 1750. Fourth Edition 1871. Mr. Tennant has added, by way 
of Supplement, ‘‘ Notes on Diamonds from the Cape of Good Hope,” read before the British Associa- 
tion, September, 1875. Price 10s. 
Il, FOR SALE.—A Collection of RECENT SHELLS, MINERALS, ROCKS, and FOSSILS, in a 
large and well-made Cabinet of 108 Drawers, with Glass Bookcase on the top. The Cabinet was the 
property of the late Mrs, Mawe, and contains her private collection of Recent Shells and Minerals. 
Amongst the latter are some Crystals of Gold figured in Mawe’s ‘Travels in Brazil,” 1812, and 
supposed to be unique, The Bookcase contains many of the recent works on Geology by Buckland, 
Lyell, Mantell, Murchison, Owen, Phillips, and others, and 30 Volumes of the publications of the 
Palxontographical Society, ete. Price £1200. 
III.—PROFESSOR TENNANT’S Private Collection of Fossils, illustrative of the British Fossili- 
ferous Deposits, the whole being stratigraphically arranged in a Cabinet with Sixty Drawers, and 
consisting of more than 2800 species, viz :— 
MORGAN VAL Ss acedae 496 
Secondary , ee 110 | 2882 Species, 
IBALEOOZOIC, “Geesecenecnene eee aD 
and comprising upwards of 8000 specimens. 
The Collection was originally arranged and named by the late Dr. S. P. Woopwarp, F.G.S., who 
also prepared a printed Catalogue of it, and many of the Specimens are figured in his ‘‘ Manual of 
Recent and Fossil Shells,” and in other scientific works. A large number of additions have recently 
been made to the Collection, and an Illustrated Catalogue prepared by Mr. William Davies, F.G.S., 
of the British Museum. 
Mr. Tennant had this Collection arranged to illustrate his Lectures on Geology and Paleontology 
at King’s College. On receiving the appointment of Keeper of the extensive collection of Minerals 
belonging to the Baroness Burdett-Coutts, he resigned the Geological chair, which he held from 
1853 to 1869. He retains the appointment, received in 1838, of Teacher of Geological Mineralogy at 
King’s College. The Lectures are given on a Wednesday and Friday morning from 9 to 10, and on a 
Thursday evening from 8 to9; they begin early in October and terminate at Easter. The Public are 
admitted on paying the College Fees. Mr. Tennant gives practical instruction, at 149, Strand, in 
Geology and Mineralogy to those unable to attend public lectures, 
IV.—A Collection of about 2000 MINERALS and ROCKS, with Models of Crystals, Diagrams, ete., 
in a painted deal Cabinet with 55 drawers, and glass case on top, 9 ft. 5 in. long, 8 ft. 2 in. high, and 
21 in. from back to front, The specimens were used from 1850 to 1867 to illustrate Mr. Tennant’s 
lectures at the Royal Military Academy, Woolwich, This Collection, with the Collection of Fossils 
above, are well adapted for illustrating fifty or sixty Lectures on MINERALOGY, GEOLOGY, and 
PALZONTOLOGY, at a first-class Educational Establishment, or would form an instructive 
Geological Museum for a gentleman. Price £2000. 
V.—FIRST-CLASS GEOLOGICAL COLLECTION in TWO CABINETS, each measuring 9 ft. 
3 in. long, 2 ft. 4 in. wide, and 3 ft, 10 in. high; each containing 45 drawers, with a glass case 
on the top of each cabinet, 4 ft. 11 in, high and 15 in, from back to front. One Cabinet is filled with 
2600 Minerals and Rocks, the other with 3400 Fossils, British and Foreign, stratigraphically 
arranged, 
The Collection is carefully named, and consists of 6000 specimens, many very choice, and selected 
principally from the Duke of Buckingham’s (Stowe sale), Marchioness of Hastings, Sir John St. 
Aubyn’s, Drs. Buckland, Bowerbank, Mantell, and other celebrated collections. The first Gold 
Nugget received from Australia, and a Gold Nugget from Ashantee, weight 5 oz., are in the collection; 
also a fine series of one hundred Diamonds, illustrating crystalline form and colour, from India, 
Brazil, South Africa, and Australia. 
Any person wishing to become practically acquainted with the interesting and important study of 
Mineralogy and Geology will find this a good opportunity to obtain an instructive and valuable 
Geological Museum, scientifically arranged, the specimens having been collected with care and at 
great expense during the last 40 years. Price Five Thousand Guineas. 
VI.—SOPWITH’S GEOLOGICAL MODELS in Wood, four inches square, accompanied with 
Letterpress Description (this can be had separately, price 2s.) :—No. 1. Stratified Rocks and Valley 
Of Denudation ; No. 2. Dislocation of Strata; No. 3. Surface Indications of Coal; No, 4, Over- 
cutting of Strata; No. 5. Undercutting of Strata; No. 6. Intersection of Mineral Veins. £3 3s. 
The same Models eight inches square, £9, 
JAMES TENNANT, F.G.S., F.B.G.S., &c., 149, Strand, W.C. — [April, 1880. 
