396 Scientific Intelligence. [Nov. 
3. Without drawing off any spirit, what quantity there is of any 
particular strength may be immediately known. 
4. Every possible fraud, during the operation, may be prevented, 
as the apparatus can either be locked up or brought into an adjoining 
apartment, for the person who attends the work does not require the 
thermometer to direct him.—(Edin. Phil. Journ, vii. p. 214.) 
VIL. Tabular Spar, Colophonite, and Pyroxene. 
Mr. H. Seybert, of Philadelphia, has analyzed the above minerals 
from the vicinity of Willsborough, Lake Champlain. He found the 
tabular spar to contain 
Biligaa.) te wsinear ads sais oon sar OO 
duime@neidias vsiaers cow asthe ceedar 9 46°00 
Alumina and oxide of iron. ...... 1:33 
Waterton a stparecdil doelawig a riawasory 1:00 
Magnesia and loss........ etree 0:67 
100°00 
This statement agrees very nearly with M. Bonsdorft’s analysis of the 
same mineral from Pargas (Annals, Oct. 1820). Mr. Bonsdorff 
obtained 
Silica... i. gevuhet. botuewoels 52°58 
Lame: silt Jing evra oylg eth oe 44°45 
Magnesia. ........ Gath oer eoee 068 
Protoxideof iron ..).. 5.6. .0e08 1:13 
Volatile matter... 2.0.00. 0000. 0:99 
A trace of aluminaand loss,..... O17 
100-00 
Mr. Seybert observes that this mineral is-a bisilicate of lime, which, 
adopting Dr. Thomson's numbers for silica and lime, appears to be the 
case. If it consisted precisely of two atoms of silica and one of lime, 
the proportions would be 51 silica, and 44°62 lime, which agree still 
more nearly with M. Bonsdorff’s analysis. 
Mr. Seybert observes, that “ it is an interesting fact, that this mine- 
ral, whether found in Hungary, Sweden, or in the United States, is 
constantly associated with substances of corresponding characters ; that 
of Dognarka is united with brown crystallized garnets and blue calca- 
reous spar; that of Pargas, with black sphene, an amorphous mineral, 
of a reddish colour, resembling idocrase or garnet, and small grains of 
a green substance, resembling actynolite (probably pyroxene); that of 
the United States, with colophonite and pyroxene. 
The colophonite yielded 
Stag, ewig st eet SSF. PEP A Fe 38:00 
Lime HEPA Phares 29°00 
Protoxide,of iron: ;s 22.4 ge 223s 25:20 
Altona). GR 2GWUIW eA oY, - 6:00 
Water vie 8 238 Ue RE EU an 7) O33 
98°53 
