372 <A. A. Julien on Minerais of the Key of Sombrero. 
cessive temperatures from 110° to 400° C. was carefully ascer- 
tained, 
Temp. of bs 1L ; 
expulsion. 
Moisture, 100° C. | 1-620 1515 1:38? 
Water, 126°-240° C, 17-983 17-419 17-191 
Water and org. matter, | Ignition. [21 865) 4-293 4600 5°461 
Combined water, ". B27 22019 22°652 
Total, 21°865' + 23:896 23-534 24082 
126° C., of the remaining two at 175°-180° C., a fraction of a per 
cent of water at 235°-23 and the basic equivalent on igni- 3 
tion; but the figures were ewhat variablé. The quantity of ' 
made from an amount altogether a little less than two grams, 
according to the method already explained. 
is IL. Ill. IV. Mean. Oxygen Ratios. 
oisture, | 21-865 1620} 1515] 1-380} 1505) ——-~——— 
Water and organic matter, 22276) 22°019| 22652 21:826/ 19-40 207 4 
Sulphuric acid, none. none.} none. 052 5 
Phosphoric acid, 42527 | 42-688) 43°103| 42°565| 42-721|23°95 2°55 ; 
Lime, 32'981*| 32-731) 83-346] 32°849| 32°977| 9°38 1° 
Magnesia, pet trace. "645 D71 “Ds 
umina, 2 ; : ; 
Sesquioxyd of iron, “454 { trace, 505 980 hee 
| 100- | 995231101133 |100-947 |100-380| 
* By difference. 
There was no trace of chlorine present, and no examination 
was made for fluorine. The results may be grouped as follows: 
Moisture,  - * : - 1-491 
Organic matter, - oe “717 
Phosphate of magnesia, (3Mg 0, PO,), 1-147 
Alumina, oxyd iron, and phosphoric acid, 1:049==4-472 impurities. 
2000, « - - $2°955 
HO, - - 2 < - §:277 
PO, i i i 
3aq. - - . és 15°832—95°908 metabrushite. 
100°38 
While, therefore, brushite corresponds to the salt of Bédeker, , 
® which contains four equivalents of water of crystallization and 
*~ which was found by Ples* in almost pure acicular crystals in the 
Sentral tissue of Tectonia grandis, we have in metabrusbite the 
allied salt of — and Berzelius, the analysis (1) and theo- 
- retical composition (2 ) of which, by Berzelius, are as follows: 
Phar fentrabl, 848, 285, 24 ee 
