Nobth Aeeas, G. to J. 45 ; Nobth East Centeae Gaeeeey, I. 45,4G.

Royal Commissioner in London , Le Chevaeiee Rieeieo de Sa, 22 Luke Street, Portland Place.Agent, F. J. Vanzeteeb, Esq., 5 Jeffreys Square.

The collection sent by Portuguese exhibitors is extremely rich in raw materials and produce, and considerableefforts appear to have been made to represent as far as possible the natural resources of a country, the manu-facturing capabilities of which remain still to be developed. Some excellent specimens of limonitc, a hydrousoxide of iron, much used as a source of that valuable metal, have been sent from Lisbon and from other places.Samples of copper, lead, and antimonial ores are also exhibited. Interest attaches likewise to the lio-nites,anthracite, and coal exhibited, which indicate available sources of mineral fuel to this country. Chemicalmanufactures appear to have been more extensively represented than some others. The specimens exhibitedare principally those of substances employed in the useful arts, as in glass-making, dyeing, &c. It would beinteresting to learn whether among these the strontian is obtained in Portugal . Various kinds of porcelain andfire-clays "are also shown. Lithographic stones from various localities, show a new source of this valued sub-stance. A highly interesting and valuable collection is that of the marbles from the Museum of the BoyalAcademy of Lisbon , and from a mineralogical exploration made by order of Government, and privateparties; and it appears to indicate in the strongest manner the vast natural resources of Portugal forthese ornamental stones. Some of the specimens shown have great beauty and singularity of veining. Agood collection of agricultural products represents the fertility of the soil of this country: wheat of variouskinds, maize, haricots, rye, all show the productiveness of the land even under indifferent agricultural manage-ment. The dried and preserved fruits, and a number of other vegetable and animal products, deserve attention.The textile manufactures are tolerably represented in cotton, linen, silk, and wool. As a vast specimen of theart of the potter, the great wine, or oil-jar from Alemtejo will receive notice. The vast capacity of similarjars not unfrequently met with in Spain and Portugal is a subject of familiar knowledge. Some works in theprecious metals are considered interesting. Some fine carvings in ivory, are indicative of much skill in theexecution of such, objects. Among vegetable products, attention mil be drawn to specimens of tobacco invarious states of manufacture, exhibited by the Bojuil Tobacco Contractors of Lisbon. Various miscellaneousarticles also add value and interest to the articles sent by this country.—B. E.

Bonnet, Caelos, Lisbon —Producer.

1 Limonite. Hydrous oxide of iron.

[This mineral exists in great abundance in the provinceof Alemtejo , district of Beja, parish of Aljustrel , placeAlgares. Vestiges of its having been formerly exploredare discovered, but at what period is not exactly known.]

2 Limonite.

[This mineral exists in the province of Estremadura ,district of Lisbon , parish of Santiago de Cacem , placeOuteiro das Sete Tijelas.]

3 Limonite (pisolitic).

[This mineral is found in great abundance in the pro-vince of Estremadura , district of Lisbon , place Algares.

Vestiges of exploring operations, which have taken placeat different periods, are found, the last appearing to havebeen in 1620.

The hydrous oxide of iron is presented in nature invarious ways, and is known to mineralogists by variousnames. Of these the limonite of Beudant is an earthymineral, of brown or yellow colour, containing 80 per cent,of peroxide of iron, and therefore 55 per cent, of iron. Itocean's entirely in sedimentary rocks, where it often formsthick masses, belonging to all geological periods, includingthe most modem. It is much worked in France , andmakes excellent iron. It is often oolitic and granular, andsometimes pisolitic, occasionally passing into ochre.—

D. T. A.]