26' BLICR 8ANO ON TfiE BANKS OP THE PON. 



in liquid potaah. The wliole \vns then thrown on a filter, 

 to separate the undissolved part; and the liquid, which 

 cuiiie throui;h, was mixed with a solution of sal ammoniac. 

 A white- povTder fell, which, after beiny heated to redness^ 

 wei^^hed 3"2 grains. It wus alumina. . 

 boa. 4. The brown substance collected on the filter was dried, 



drenclied in oil, and heated to redness. Jt was strongly at- 

 tracted by the magnet, and weighed 5^1 grains. 



5. It was digested in diluted sulphuric acid ; but not 

 being rapidly acted upon, a quantity of muriatic acid was 

 added, and the digestion continued. The whole slowly 

 dissolved, except a blackish matter, which became white 

 when exposed to a red heat, and, as far as I could jndge 



More oxide of from its properties, was oxide of titanium, slightly contami- 

 maniura. nated with iron. It weighed 1*8 grain. 



6. The acid solution being concentrated by gentle eva- 

 poration, a number of small yellowish-coloured needles 

 made their appearance in it. By repeated evaporations, all 

 the crystals that would form were separated. They weighed 

 6 grains. I redissolved them in water, and added some 



Oxide of ura- ammonia to the solution. A tine yellow powder fell, which 

 mum. I g^Qj^ recognized to be oxide of uranium. It weighed 4"i 



grain*^. 



7. Thus it appears, tliat the 52 grains (No. 4), attracted 

 by the magnet, contained 4t) grains of iron, and 6 grains of 

 uranium and titanium. 



Resuhsofihe 8. The following are the substances separated from lOQ 

 analysis. grains of iserine, by the preceding analysis: 



Oxide of titanium 54*8 



Oxide of iron • 46*0 



Oxide of uranium 4*2 



Silica l6-8 



Alumina 3*2 



Total, 155-Q 



Hera is an excess of no less than 25 grains, (o be accoun.ted 

 for by oxigen, which must have united to the three metaU 

 during the process. As to the silica and alumina, there can 

 be little hesitation in ascribing them to grains of sand, 

 vhich had been mixed with the ore. The pure iseriue, in 



I 



