YOUNG (J. R.). The Elements of the Differential Calculus. 12° Lond.

1831.

YOUNG (MATH.) Tables, showing how to reduce spirits. 8° Newcastle,

1830.

YOUNG (THO.). Memoir of his life. 8° Lond. 1831.

ZACH (FRANÇOIS). L'attraction des montagnes et ses effets sur les fils à plomb ou sur les niveaux des instrumens d'astronomie, constatés et determinés par des observations astronomiques et géodésiques, faites en 1810, à l'Ermitage de notre-dame des anges, sur le mont de Mimet; et au Fanal de l'isle de Planier près de Marseille; suivie de la description géométrique de la ville de Marseille et de son territoire; 2 Vol. 8° Avign. 1814.

NATURAL HISTORY.

A PIECE of meteoric iron, from Bittsburg, near Treves. Presented by H. Heuland, Esq.

NATIVE silver richly disseminated in carbonate of lime, from Coquimbo, Chile. Presented by Alexander Caldeleugh, Esq.

SULPHURET of copper and iron with radiated quartz, &c., from the Hartz.

CRYSTALLIZED Sulphuret of silver on quartz, from Schemnitz, Hungary. MASSIVE Sulphuret of silver and copper, from Copiasso, Chile. Presented by Alexander Caldcleugh, Esq.

POLYBASITE, from the Morgenstern mine, Freiberg.

OXIDE of manganese, in primitive crystals, &c., from Ilefeld, Hartz.
MAMMILLATED hematite, from Lancashire.

STRIPED granular oxydulous iron or magnetic iron ore, from Norway.
Presented by H. Heuland, Esq.

RED oxide of copper, with filiform native copper, from the Bank mines, Siberia.

CORALLOIDAL tile-ore, from the Bank Mines, Siberia.

COPPER pitch ore, stalactic, with green carbonate of copper, &c., from Moldava, Bannat.

BLACK Copper ore with native copper, from the Bank Mines, Siberia.

A SPECIMEN of the same with green carbonate of copper, from Chile. Presented by Alexander Caldcleugh, Esq.

HEMITROPIC Oxide of tin on quartz, from Ivikaet, South Greenland. OXIDE of tin with tungstate of lime, from Schlackenwalde, Bohemia. AMORPHOUS Sapphire with grey spinel in quartz, from New Jersey. VARIETY of the same, found by Mr. Rose, at Barsowskoi, near Kieshlim, Ural. Presented by H. Heuland, Esq.

INDIANITE with some corundum, from the Carnatic.

PRUNNERITE, in cuboid crystals, on pearly stilbite, Vargoe, Faroe.
PSEUDOMORPHOUs lenticular hornstone, from Schneeberg, Saxony.

KNITTED calcedony with magnesian carbonate of lime, from Guanaxuato,
Mexico.

A SERIES of crystals of zircon, from Lake Ilmen, Siberia: some crystals of the same from Norway.

WHITE variety of the same, from Laach on the Rhine.

CYANITE with staurolite, from St. Gothard.

AMORPHOUS lenzinite, from St. Sévère, Dep. des Landes.

VARIETY of mesotype (scolecite) in globular concretions, from Montecchio Maggiore, Vicentino.

DIPYRE, from Libareus, above Mauléon in the Pyrenees.

FAHLUNITE, with pyrites in chlorite slate, from Fahlun, in Sweden.
BLUE and yellow silicified asbest, called krokydalite, from South
Africa.

DARK-GREEN diopside, in fascicularly aggregated crystals, from Tyrol.
Presented by G. V. Duval, Esq.

VARIETY of the same, called Baik-lite, from Siberia.

A LARGE mass of cinnamon stone or essonite, from Ceylon.
THE SAME, crystallized, with scapolite, from North America.
SORDAWALITE, from Sordawala, in Finland.

FRAGMENT of a very large prism of bluish grey beryl, from Ackworth,
New Hampshire.

A MODEL of a crystallized emerald of large dimensions. Presented by Messrs. Rundell and Bridge.

FIVE varieties of colour of tourmaline, from Brasil.

BLACK crystallized tourmaline, from Bovey.

ROSE-COLOURED tourmaline in quartz, from Rozna, Moravia.

CYLINDRICAL black tourmaline with brown quartz, from Johanngeorgenstadt, Saxony.

CYLINDRICAL black shorl, from Sue, near Vicdessos, Pyrenees.

THE SAME, from Käringsbrika, and from Utoe, Sweden.

THE SAME, from Haback, Tyrol.

EUDIALYTE, with sodalite and arfvedsonite, from Kangerdluorsuk, South Greenland.

TOPAZ crystallized, embedded in rock crystal, from the Capitania of Olinda, Brasil.

Two Topaz Crystals, and a small specimen of Yellow Semi-Opal, from Brazil. Presented by Mr. Thomas Dobson.

TITANIFEROUS iron, from Lake Ilmen, Siberia.

CRYSTALLIZED and massive tungstate of lime, from Cumberland.
CRYSTALLIZED tungstate of iron and manganese, from Bohemia.

ORANGE-COLOURED molybdate of lead, with carbonate of lead and silicate of copper, from Retzbanya, Hungary.

THREE varieties of molybdate of lead, from Bleiberg, Carinthia.

QUARTZ, coloured by oxide of chrome, from Ecouchets, Depart. of the Saone and Loire.

ANOTHER Specimen, polished.

DIVERGING fibrous carbonate of baryta, from Nerchinsk, Siberia. BARYTOCALCITE, massive and crystallized, from Alston Moor, Cumberland.

ARRAGONITE, variously crystallized, from Kosel, Bohemia.

THE SAME, crystallized, spicular, &c., from Kamsdorf, Saxony.

GREEN stalagmitical and radiated varieties of the same, from Marie aux
Mines.

THREE varieties of the same, the binaire, &c., from Dauphiny.
Two varieties of the same, from Wales.

SEVERAL varieties of crystallized carbonate of lime, from the Hartz, and from Saxony.

A LARGE specimen of the dodecahedral variety of the same, from Guanaxuato, in Mexico. Presented by Edward Hurry, Esq.

THE SAME, with native silver, from Mexico.

CHLOROPHÆITE, with stilbite, &c., from Dalsnypen, Faroë.

SEVERAL varieties of stalagmitical carbonate of lime, from Carlsbad, Bohemia.

THE SAME, fibrous, stalactic, from Montmartre, near Paris.

TUFACEOUS Carbonate of lime, from Puerto del Nascimento, Chile. MASSIVE carbonate of magnesia, from Salem, in the East Indies. Presented by H. Heuland, Esq.

CRYSTALLIZED magnesian carbonate of lime, from Traversella, Piedmont. THE SAME, from Guanaxuato, Mexico, and from Schemnitz, Schneeberg, &c. VARIETY, called miemite, with wavellite, from Kannioak, North Greenland.

A SLAB of flexible dolomite, from Pennsylvania. Presented by Thomas Meade, Esq.

STALACTICAL magnesian limestone, from the Aquæduct of Maintenon, France.

HACKED brown-spar, from Kapnik, Transylvania.

FRAGMENT of a vein of pearl-spar, obliquely traversed by fine layers of blende, from Siberia.

BROWN-SPAR with amethyst, from Schemnitz, Hungary.

BOTRYOIDAL carbonate of zinc, from Bleiberg, Carinthia.

THE SAME, with red silver ore, from Bohemia.

CRYSTALLIZED carbonate of lead, in a macled group, from La Croix, Vosges.

THE SAME, fine-granular, from Biscay, Spain.

EARTHY green carbonate of copper, from Mexico.

Two specimens of the same, from Linares, Spain. Presented by Capt. Clark, R.N.

SEVERAL varieties of compact malachite, from the Gumashefsky mines, Siberia.

SATIN malachite, from Barnaul, Siberia.

MAMMILLATED blue and green carbonate of copper, from Smeoff, Siberia. BLUE carbonate of copper, with hydrate of magnesia, from Chessy, near Lyons.

EARTHY blue and green carbonate of the same, from Moldava, Bannat. PHOSPHATE of iron, from Auvergne, and some specimens of oxydulous iron, from Norway, &c. Presented by H. Heuland, Esq.

PHOSPHATE of lime, crystallized, from Traversella, Piedmont, and from
Maggia, St. Gothard.

THE SAME, on rock crystal, from Schlackenwalde, Bohemia.
THE SAME, with cubic fluate of lime, from Altenberg, Saxony.
FIBROUS apatite (phosphorite), from Schlackenwalde, Bohemia.

BOTRYOIDAL vanadiate of lead, from Leadshill, Scotland.

CRYSTALLIZED phosphate of lead, from Hoffsgrund, Breisgau.

SULPHATE of baryta, called chain-spar; with another variety of the same, from Iberg, in the Hartz.

THE SAME, crystallized, from Gersdorf, Saxony.

FIBROUS Sulphate of strontia, from Frankstown, N. A.

SULPHATE of lime, from La Catolica in Sicily; from Schemnitz in Hungary;

from Madrid and Compostela, in Spain; from Catorze, Mexico. SULPHATE of lead, epigène, with plomb-gomme, from Huelgoët, Lower Britanny.

GREEN octahedral fluor-spar, with cleavelandite, from Baveno, Lombardie.

A SPECIMEN of coal, from a mine belonging to Lord Fitzwilliam, which had been accidentally set on fire. Presented by J. Berkeley, Esq.

A FEW Specimens of secondary fossils, from the blue clay of Hampstead. Presented by E. II. Neveson, Esq.

A CAST of part of the lower jaw of an undescribed fossil species of Moschus. Presented by S. P. Pratt, Esq.

SOME rock specimens collected during his last expedition to the South Sea, and presented by Capt. King, R.N.

AN Esquimaux canoe, from Behring's Strait. Presented by Capt. Beechey, R.N.

A SPECIMEN of the Indian Ichneumon (Herpestes griseus?) from India. Presented by S. Sotherby, Esq.

SKULL of a Dolphin, (Delphinus Delphis?) from the Cape. Presented by Mrs. Ince.

SPECIMENS of Pekan Weasel, (Mustela canadensis;) Beaver, (Castor fiber;) Little-Chief Hare, (Lagomys princeps;) Drummond's Dormouse, (Myoxus Drummondii ;) Tailless Marmott, (Arctomys empetra;) Parry's Marmott, (Arctomys Parryi;) Star-nosed Mole, (Condylura cristata;) Canada Jumping Mouse, (Gerbillus canadensis,) from Canada; Two Puma skins, (Felis concolor;) and Three skins of the Californian Wild Sheep, (Oris montana,) from California. Presented by the Hudson's Bay Company.

A RECENTLY Dead specimen (from which a preserved specimen and skeleton have been made) of a New Species of Prehensile Weasel, (Paradoxurus Crossii,) from India; A recently dead Cape Cat, (Felis Capensis.) Presented by Edw. Cross, Esq. Proprietor of the Surrey Zoological Gardens.

A TUFT of Hair from the Head of a Male Inhabitant of Tanna Island, one of the New Hebrides. Presented by George Bennett, Esq. SPECIMENS of Petaurista Taguanoides, the white-headed variety. A Specimen of a New species of Rat, (Pseudomys Cunninghami,) and the skull of a very large adult Wombat, (Phascolomys nombat,) from New Holland. Presented by Allan Cunningham, Esq.