118 Scientific Intelligence. 
Si Mg Ca Fe 
Tremolite (G.==3:003), 57°62 26°12 14:90 0°84 = 99-48 
Diopside (G, = 3°249), 5511 18°39 25°63 0°54 = 99°67 
Both analyses give almost precisely the ratio of bases to silica of 1 +2. 
V. Skolopsite—This mineral, described by v. Kobell, occurs at Kaiser- 
e fragments are colorless and transparent, but the larger mas v 
a gray, greenish or reddish color. Gelatinizes with ehlorhydrie acid, 
giving off a trace of sulphuretted bydrogen, an eti a little ear- 
8 Re a Pe On Mg “Ra 
1, 136 462 35:41 21°39 2:24 15°50 231 12:17 287 329 
2, 7 8417 2061 3:16 1470 304 1174 2-73 
Mean, 136 4:39 34:79 21:00 270 1510 267 11°95 280 329==100 05 
Oxygen, O31 263 1825 9 838 O81 431 1°07 38°09 O47 292 
a En i. = 
10 64 8-94 
n acid and bases, and of 2:3 between the protoxyds an 
sesquioxyds. Rammelsberg writes the formula, 2k?Si+ Si', which 
would be a ratio of 2:2: 5, instead of 2:3: 5. e considers it analo- 
gous to Sodalite, Nosean, etc., and, inclusive of the chlorid and sulphate, 
gives the following formula for the mineral, 2RC1+ 3 (2R,Si+ B*si3) + 
s(2kS + 3(2R?Si + BSi,) J. 
VI. Pyroxene—Analysis of the dark-green augite associated with 
skolopsite : 
Bi x Ca Fe Mg Mn 
48°02 2°67 2534 13°57 974 1:28 = 100°62 
—Jour. prakt. Chem., Ixxxvi, 340. G. Js Be 
4. On a Volcanic Island in the Caspian; by Count Marscuatt of 
enna.—The existence of this island was first made known by Captain 
Koumani, of the Russian schooner Jourkmen, on the 7th of May, 1861. 
Its situation is in 39° 34! 14” N., and 47° 15/20” E. from Paris. At 
the time of its discovery it was 400 to 500 paces in circuit, elliptical im 
outline, and in surface a plain slightly elevated at centre. About the 
gases were escaping; the temperature of the waters, according to Mr. 
Abich’s observations, was 28°-4 R., that of the air being 20°3 R. 
