210 
ME. N. STOEY-MASKELYNE ON THE 
On a third treatment in a similar way 0-0424 grm. yielded : 
per cent. 
, .. . a nm it • (by acid, 0*0091 = 21-47) 
Of mineral dissolved =0-021 7, viz.' ^,[ = 51-18 
(by potash, 0-0126 = 29*71) 
Of mineral unacted on=0-0207 =48-82 
I. 
II. 
III. 
Silicic acid .... 
5-408 
5-141 
6-724 
Magnesia 
2-367 
1-353 
4-61 
Lime 
1-048 
0-270 
0-432 
Iron oxide .... 
0-187 
0-676 
0-576 
Potash 
0-121 
0-528 
0-504 
Lithia 
trace 
trace 
9-131 
7-968 
12-846 
Soda found 
0-126 
1-217 
1-042 
In the last two treatments of the white silicate the quantities, 0-0437 and 0-0091 grm., 
of ingredients dissolved by the acid and 0‘07 and 0-0126 of silicic acid dissolved by the 
potash were too small for even approximate analysis. The ratio of silicic acid to the 
bases, neglecting the small amount of the former dissolved by the acid, is in the last case 
in the ratio of 58-4 Si 0 2 : 42 bases, that of the analysis of this white variety giving a 
ratio of 58-4 : 41-6. 
The degree to which the augite is soluble was determined by subjecting this mineral 
to a treatment similar to that by which the enstatite was dissolved ; 0*2714 grm. so treated 
for eighteen hours by acid, and a similar time by potash at 100° C., gave 0-2614 of 
unchanged, and 0-0193 of dissolved mineral. This corresponds to 7 - 384 per cent, of the 
latter and 92-616 of the former. 
There can be little doubt from these results that the action of acid on the minerals 
with the formula of enstatite or of augite is that simply of a solvent. 
X. The Iron of the Busti Meteorite. 
A small pepita of the iron, weighing 0-1997 grm., contained in the meteorite was 
analysed. A small quantity of silicates and of glistening Schreibersite was left at first 
undissolved by hydrogen chloride. A second treatment with acid dissolved the latter. 
The first solution contained a trace of phosphoric acid, and a small quantity of hydro- 
gen sulphide came off from the iron during its solution. The metallic constituents of 
the dissolved portion were separately determined, and an analysis was also made of the 
Schreibersite. The results were : 
