yO OBSERTATIONS ON URANIUM. 



hol, which dissolved the muriate of uranium without touch- 

 ing the muriate of lead. 

 Th»muri»t^of Xhe muriate of uranium, after the alcohol was driven off 

 s'ou"ed in water ^y li^at, was diluted with water, and subjected to the fol- 

 ind examined, lowing experiments, 1. Pure and carbonated alkalis formed 

 in this solution very deep bottle-green precipitates. These 

 precipitates, particularly that from ammonia, turned black 

 and shining when dried, 2. Prusniate of potash produced 

 -.a deep chocolate brown precipitate. 3, Infusion of galls 

 occasioned a greenish brown sediment, which in time 

 changed of a yellowdh red in the upper part. 

 Precir'tate by The precipitate formed by ammonia in the muriatic so- 

 zmrnonia, lution of uranium, though completely washed and djied in 

 , the open air, still retains much witer and ammonia; for on 

 «-iIcincd, being heated in a glass retort, it gave out a perceptible 



quantity of these two substances, and acquired a still deeper 

 black colour, 

 and dissolved This matter, thus dried, dissolved readily in nitric acid 

 in niiri€ acid, (diluted with water, even cold : but the solution, which had 

 a green colour, immediately oa being heated gave out a 

 considerable quantity of nitrous vapours, and at the same 

 time acquired an orange yellow colourc 

 The solution The solution of this calcined oxjde in nitric ^cid hatviHg 

 iiluted^ ]3een diluted vath water, after some time it let fall a small 



quantity of oxide of iron. This ore of uranium therefore 

 contains small quantities of lead, iron, sulphur, and silex. 

 It appears to be the kind analysed by Mr. Klaproth under 

 the name of pechblende of Joachimsthal. 

 b precipitated Thjs new solution of oxide of uranium in nitric acid was 

 by alJcalis, precipitated of an orange yellow by caustic alkalis, and of a 

 pale yellow by alkaline carbonates, an excess of which re- 

 dissolved the piecipitate. 

 ■russiate of Prusbiate of potash and infusion of galls formed in this so- 



jpoiasb,& galls, lutiojj precipitates of a brown red much lighter than before. 

 Green oxide ^h^ green oxide of uranium united with liquid oximuri- 

 dissolvei ill ^tic acid soon destroyed its smell and colour; and the solu- 

 * tion gradually assumed a yellow colour, like that efFecte4 

 by nitric acid, 

 •nd in other The combinations of the green oxide of uranium with 

 li*i ' ^""y^*-^* the sulphu, ic, nitric, muriatic, and acetic acids, evaporated 

 * - * to 



