minium, nickel, and copper; or, in effect, it is aluminium added to German silver. The great

advantage of this metal is that it will keep its beautiful white lustre for all time, and permits of objects being made from it in an enduring and substantial manner. It requires no plating of any kind.

ALUMINIUM AND GOLD.

Tissier: Aluminium endures a large quantity of gold without its ductility being impaired. We have prepared an alloy with 10 per cent. of gold which works at a red heat as well as aluminium, is a little harder but scarcely polishes any better than it. Its color, for some cause, is darkish brown, like that of tin lightly sulphurized. The alloy containing 15 per cent. gold can no longer be forged. As to the effect of small quantities of aluminium on gold, 5 per cent. of it gives to the latter a white color and makes it brittle as glass.

Fremy The alloy with one per cent. aluminium possesses the color of "green gold;" it is very hard but yet malleable. The alloy with 10 per cent. aluminium is white, crystalline, and brittle; the alloy with 5 per cent. is brittle as glass.

Mierzinski: Aluminium can take up as much as 10 per cent. of gold without its malleability decreasing. This alloy can be forged, but not well polished. The color of the gold has entirely disappeared, seeming to have no effect on the aluminium.

ALUMINIUM AND PLATINUM.

Tissier Aluminium unites with platinum with great ease, forming with it alloys more or less fusible according to the proportions of aluminium. Five per cent. of platinum makes an alloy not malleable enough to be worked; it is probable that by diminishing the amount of platinum a suitable alloy might be produced. In color it approaches that of gold containing 5 per cent of silver.

ALUMINIUM AND CADMIUM.

Deville Cadmium unites easily with aluminium. The alloys are all malleable and fusible, and may be used to solder aluminium, though imperfectly.

ALUMINIUM AND BORON.

Deville: "By melting aluminium with borax, boracic acid, or fluo-borate of potassa, an alloy very rich in boron was obtained. This alloy, like siliceous aluminium, possesses the singular property that the boron diminishes all its useful qualities. The alloy is very white, only able to bear slight bending, and tears under the rolls. It exhales a very strong odor of hydrogen silicide, SiH', without doubt due to the silica of the vessel which was attacked at the same time as the borax. M.

Wöhler and I have shown that the boron may be extracted from this alloy in two different forms, the graphitoidal and the diamantine boron." Deville gives at the end of his volume on aluminium the mode of preparation of this diamantine boron.

ALUMINIUM AND CARBON.

Deville: I was not able, by any effort I made, to combine carbon with aluminium. On decomposing carbon tetrachloride, CCl4, by aluminium, there is formed ordinary carbon, while the aluminium which remains has undergone no change.

Cowles: Specimens of alloys of aluminium and carbon, yellow and crystalline, have been exhibited, which were made in the Cowles furnace. (See p. 195.)

ALUMINIUM AND GALLIUM.

Watts: Lecoq de Boisbaudran makes the following remarks: "If the proportion of aluminium is to be considerable, the two metals are melted together at dull redness. The alloys thus obtained remain brilliant, and do not sensibly absorb the oxygen of the air in their preparation. After cooling they are solid but brittle, even when the excess of aluminium has raised the melting point to incipient redness. They decompose water in the cold, but better at 40°, with rise of tempera

ture, evolution of hydrogen, and formation of a chocolate-brown powder, which is ultimately resolved into white flakes of alumina.”

ALUMINIUM AND TITANIUM.

"Wöhler* fused in a clay crucible 10 grms. of titanic acid, 30 grms. cryolite, 15 grms. each of NaCl and KCl, and 5 grms. of aluminium. This was kept at the melting point of silver for one hour and then opened. The aluminium had become lammelar, and when dissolved in caustic soda left a quantity of brilliant, crystalline plates, found to be a compound of aluminium, titanium, and silicon. The elements of the compound appear to be able to unite in various proportions. Its density was 3.3. It was infusible before the blowpipe, but heated to redness in chlorine it burnt, giving chlorides of the three metals present. Another experiment, heated only to the melting point of nickel, gave a white compound richer in silicon, sp. gr. 2.7.

Alloyst of aluminium with wolfram, molybdenum, and manganese were made by Michel in Wöhler's laboratory, on which the following report is made:

* Chem. News, 1860, p. 310.
† Ibid.

ALUMINIUM AND TUNGSTEN.

Al W was made by fusing together 15 grms. tungstic acid, 30 grms. cryolite, 15 grms. each of KCl and NaCl, and 15 grms. aluminium, at a strong red heat. The excess of aluminium was removed from the regulus by HCl. The alloy is an irongray powder, crystalline, single crystals were several millimetres long, brittle and hard rhombic prisms. Sp. gr. 5.58. Hot caustic soda extracts all the aluminium from these crystals, leaving behind pure tungsten.

ALUMINIUM AND MOLYBDENUM.

Molybdic acetate is dissolved in hydrofluoric acid, the solution evaporated to dryness, and the residue mixed with cryolite, flux, and aluminium, in the same proportions as given for tungsten. Excess of aluminium is dissolved from the product with caustic soda, and there remains a black, crystalline powder consisting of iron-gray rhombic prisms, soluble in hot nitric or hydrochloric acid, and consisting entirely of aluminium and molybdenum.

ALUMINIUM AND MANGANESE.

We fused together 10 grms. anhydrous manganese chloride, 15 grms. each of KCl and NaCl, and 15