WICKEL AND COBALT. 2^7 



cxide of nickel, (which was ('eparated from the triple fait, 



not diflblred at the firll evaporation, by carbonate of potafh, 



was treated repeatedly, (in fuch a manner) Ihat after diflblving 



it in nitric acid, recourfe, was had to the iifeof ammonia and 



evaporation as before defcribed. In (his method was obtained, 



entirely free from cobalt, an oxide feparated by potafb from 



the triple fait, which had been reditfolved after evaporation, 



and which oxide had the properties mentioned in the memoir 



printed in the fecorid volume of the Annales de Chi«iie. 



The oxide which was feparated by evaporation from the The oxide en- 



ammoniacal nitrate of nickel, was in the laft operation en- ^"".^'y ^f^^'! ^™'" 

 • I f jr .1-1 • . /in I I cobalt m the laft 



tirely treed trom cobalt ; it only contained a Itill, as has been operation. 



obferved, a little nitric acid. The oxide of nickel, which, 

 after having been laid bare by evaporation, ftill contains co- 

 balt, may naturally undergo the fame operation over again. 



This method may be made ufe of untill one more expedi- This method rew 

 tious is difcovered by farther experiments, fince it does not '°''"'"^"'^^** ^o»" 

 Gccafion any confiderable expence, for by potafli, the evapo- the ammonia 

 ration of the ammonical nitrate of nickel may be etfefted in a '"^y ^^ '^''ed 

 retort, and alfo the fubfequent decompofition of the triple prgcefs. 

 fait, and thus the ammonia may be feparated for other ufes ; 

 in like manner, in works on a great fcale, a part of the nitre and the nitre 

 may be recovered from the laft operation, by the evaporation ""^"^'^* 

 ^^i the water i n which the iubftance has been waftied. 



XV III 



Suga r prepared from Beet y . Bi^ M. H e r m b s t a d t . * 



A HE method of M. Achard for ex(ra6ling fugar from beets, 

 was fo expenfive, that it was of no advantage for common 

 ufe. M. Hermbftadt, of Berlin, has pra6lifed another me- 

 thod, which is eafily performed, and affords hopes of ren- 

 dering this fugar cheaper than that from the fugar-cane; 

 which is as follows : 



After having bruifed the beets in a mortar, M. Hermbftadt 

 fubmits them to the operation of a prefs, to exfraft the juice The expreffed 

 from them ; which is then placed in veffels, and cla sifted with J"'".°^ J^?- ^ 

 lime in the fame manner as cane-fugar. by Jime, 



• Somiini'9 Journal, Tom. II. p.^1. 



When 



