Galva7us?7i, JS7 



gerts, that in the purest state in which it has been hitherto 

 obtained it contains still a great deal of copper. M. Rich- 

 ter has discovered a sure method of freeing it from thaf 

 metal. 



Purified oxides of nickel are of a much livelier green co- 

 lour than common oxides, and their solution iri ammom^ 

 is of a very pale blue colour, 



ALKALINE METALLIC SOLUTIONS PRECIPITATED BY 

 OTHER METALS, AND BY PHOSPHORUS. 



Klaproth has found that solutions of metallic oxides ii^ 

 alkalies are as easily precipitated in the metallic state, by 

 other metals soluble in the same salts, as also by phospho^. 

 rus, as acid metallic solutions are. He makes a very inge- 

 pious application to analysis of tin ores, according to a 

 method which he indicates in his (Beitraege) collections. 

 In this process, tungsten is separated bv zmc from tung- 

 state of ammonia, under the term of black Hakes. 



DECOMPOSITION, BY BOILING WATER, OF SUCCINATE OT 

 IRON OXIDATED AT A MINIMUM. 



Bucholz, in examining M. Gehlen's method of separate 

 ing iron and manganese by the help of succinate of potash, 

 has found that succinate pf iron, oxidated at n niinimum, is 

 entirely decomposed by boiling it with distilled water, so 

 that the water dissolves the aeid with an inappreciable 

 quantity of oxide. The same chemist is enijjloyed in exa- 

 mining uranium and its combinations. 



GALVANISM. 



Brugnatclli, in a letter to M, van Mons, says, Volta is 

 still employed on electricity. He has lately constructed 

 different piles, composed merely of saline substances of ^ 

 different nature, with solutions of which he impregnated 

 disks of bone. 



I have lately, adds he, gilt in a complete manner two 

 large silver medals, by bringing them into comnninication, 

 by means of a steel wire, with the negative pole of a \'ol- 

 taic pile, and keeping them, one after the other, immersed 

 in ammoniuret of gold newly made and well saturated*. 



* The res\ilt here detailed reminds me of one somewhat similar, 

 which took place during some experiments ptrf'nrmeil some years aj/n 

 at the Ai>kc>ian rooms. Sunt gold kaf was j)ur loose upon a new pine 

 pf copper coin, which was then brought into the circuit of riic pile; a 

 part of the gold was infla;ned, and othtr portions adhered lo the surfapc 

 of the copper ascmplettly ;is if thty had been attached by any common 

 gilding process. Ki>iT. 



