* 
brilliant, like silver, white with a scarcely perceptible tinge of yellow. In 
the erucible, — faves a single a As thus prepared, magnesium ¢¢ 
tains car sen, ag 
mal the author distil the raw product in tubes of gas-retort 
114 Scientific Intelligence. 
eqs. of tungstic to 1 eq. of silicic acid: the neutral salts contain four 
equivalents of base, but it is perhaps more proper to double the formulas, 
ve the neutral salts the general formula 8RO,20W0O,, 2Si0,, in 
order to include the acid and double salts— Comptes Rendus, a i 
Ann. der Chemie und Pharm., exxv, 362. 
2. On the preparation and properties of metallic rubidium. Ronell : 
has prepared metallic Ponte by igniting in a proper apparatus the 
carbonized bitartrate of the oxyd. From 75 grammes of the salt, 5 
metal were obtained in a single mass. Rubidium is very 
the air it oxydizes creed to pam cer ga and takes fire, after @ 
few minutes, much more easily than pire assium. 10° C, it is still as 
soft as iron: it melts 8°°5 C., below a as hee} is converted into — 
a blue vapor with a wade of préen. Riese to Bunsen, the true fusing — 
— of sodium is 95°6 C., and that of potassium 62°-5 C.; the latter does 
not pass through an intermibdinte e pasty condition in Fata: The density 
of Ghiditini is about 1:52. It is considerably more electro-positive than 
potassium, takes fire upon water and burns with a flame which cannot be — 
distinguished from that of potassium by the eye. Rubidium burns with 
brilliancy in chlorine and in the vapor of bromine, iodine, ule and 
arsenic.—Ann. der Chemie und Pharmacie, exxv, 367. . G 
3. On the preparation and properties of metallic vidipniiced calm 
See ees Devite and H. Canon have given a description of the 
ost recent and improved method of preparing magnesium, and of the 
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by fusing together 60 grammes of chlorid of sodium and 75 gra mmes| 
chlorid of potassium (Wohler’s pct peas “Pe a cooled mass, 4 
wing with the ao ede 1 floa t, but, as the | 
the magnesium becom paiialty hotties, on to the bottom 
nm and nitruret of um. To obtain the pure 
Se Seleeet by & current of byt g 
