358 REPORT—1846. 
parative experiment with platinum wire alone, a decided yellowness 
indieative of soda was observed. 
b. By the addition of the solution of antimoniate of potass to a few 
drops of the solution on a watch-glass, a minute quantity of preci- 
pitate appeared. 
9. Sulphur. Hydrosulphuric acid was copiously evolved by the action 
of hydrochloric acid. Sulphur existed in three states, free, combined as sul- 
phuret, and also as sulphuric acid. The free sulphur was not estimated. 
The nitrous acid process was adopted. 14°74 grains, weighed after expul- 
sion of the sulphur by heat, furnished of sulphate of baryta 1°71. By a 
second determination of sulphur 13°01 grains, heated as before, and treated 
with nitrous acid, gave of sulphate of baryta 1°58. By the first total sul- 
POU...) WOR eee eww TGA. Gs cee we 1°60 per cent. 
Bythe weeontd ai «esses jes 3 22 1°67 
Sine ince ucarict qe ae EPR” 1°63 
phur, were digested with hydrochloric acid. Evaporation to dryness was 
omitted, and the solution was immediately filtered; baryta water was added 
to the filtrate. The sulphate of baryta weighed 0:104, This, by tables, 
corresponds to 0°37 per cent. of sulphuric acid, and to 0°15 of sulphur. 
The whole amount of sulphur is 1°63. Therefore 1°63—0°15=1°48 is the 
sulphur combined as sulphuret,. 
10. Phosphoric acid was not sought for. 
7. Anatysis &. By J. P.. 
1. Weight of slag, after treating as before, 20°31 grains. 
2. Silica 5°76. 
8. Alumina 4°93. 
An accident occurred in the determination of the lime. 
7. Anatysise. By J. P. 
1. Weight of slag, after heating as before, 20°23 grains. 
2. Sulphate of lime 20°77. 
3. Phosphate of magnesia 1°44, 
Analysis tabulated. 
a. 
b. eC Mean Oxygen. 
Silica, eee Pts sens QSOS SLO sO teen. s« QBS evn Aone a aieg 
AM NAMI NS Weed Se DE OD .  QMaOTIRES. 2 ye 4 BAW Se he 11°33 
DB Sy i a sie ous 5 ahd geo A390 shah ale 39°96.. 40°12.. 11°27 
IBERIA eis oe es we DQ aier <stehets 262). DQ aes 19°49 
Protoxide of manganese .. 0°07 ...<..--....-- 0°07.. O01 
Protoxide of iron........ ae Mee AE Se Ry 4c Ba 0:27... 0-06 
Potass with trace of soda ............--0--- de OOS tnt Glee 
Silphateiar Wine yy oo rs 22 EO, ae en iy ear 
Sulphuret of calcium. 6/2 ay dpe} en eae 
100°09 
Error of excess ....... tr ep A att eee 0:09 
This interesting specimen approximates very nearly in composition to 
Gehlenite, of which we introduce the following analyses for comparison (see 
Rammelsberg). 
