> . Bibliography. 191 
1g y a er, but not sufficient to brown the glazed paper on which the 
= ion was performed, lost on being burned, 6.90 grains of vege- 
: ‘ geet: 
e soil was then mixed with four times its weight of carbonate 
of potash, and was fused at a full red heat in the platina crucible, so as 
to tender’ the whole soluble in water. The mass was then dissolved 
afk the crucible by means of boiling water, and was acidulated 
-muriatic acid, and then evaporated to entire dryness, so as to 
render the silica insoluble. The whole mass was then rubbed to a 
fine powder with an agate pestle, and moistened with muriatic acid. 
Then all the matters soluble in acidulated water were taken up by 
means of distilled water. The whole was then poured on a double 
filter, and the silex was collected, washed until pure, dried and igni- 
ted ; the second filter being burned and counterpoised against it. The 
silex weighed while warm amounted to 47.39 grains. The solution 
that had passed the filter was then treated with a little nitric acid, and 
boiled to peroxidize the iron. Ammonia being then added in slight 
excess, the alumina and peroxide of iron being precipitated together 
were collected, and washed thoroughly for several days with boiling 
water, until the water came through the filter pure. The alumina 
and peroxide of iron were then separated by means of a boiling so- 
lution.of pure potash, in a silver crucible. _When all the alumina 
was taken up by the potash, and the iron had subsided, it was filtered 
ina double filter, and the peroxide of iron being collected, washed, 
dried, ignited, and weighed, amounted to 11.20 grains. The alumina 
Was separated by neutralizing the alkaline solution, and was then pre- 
cipitated by means of a solution of carbonate of ammonia. When 
collected on a filter, washed, dried, ignited; and weighed, it erecta 
to 32.10 grains. 
“The solution from which the alumina and iron had been separa- 
ted, was then treated with a solution of oxalate of ammonia, and the 
lime was precipitated i in the state of an oxalate, and when collected, 
washed, dried, ignited, and converted into a carbonate, weighed 2.85 
grains. The remaining solution being tested for magnesia, gave no 
trace, but a little manganese was detected by hydrosulphate of am- 
monia 
" = of this analysis of the ot soil : 
Vegetable matter,  . Lehat s 6.90 
Silex, & ¢ j 3 $ ‘ 47.39 
Alumina, . ; i " ‘ ga -22an 
Peroxide of iron, " : ;: 11.20 
Phosphate and crenate ‘of sé See . 2.02 
Manganese, traces, 
+ 
: “ 
* 
ey 
