156 Scientific Intelligence. 
ment was made.on the authority of an article in the Atlantic 
Monthly (March, 1883, p. mul er enn the personal ia feta 
of the . (H. D. Warner), in an earthquake occurring - 
2.20 a.M., September 7. The year was oe given, but it was 
natural inierenee that it referred to the shock felt in adjeneie 
districts at 3.20 a.m., September 7, 1882. On re again at 
the article I see that it might refer to some previous year, and I 
presume that is the fact. Probably Mr. Hae could tell that 
year it was. 
correction needed to the notice on page 357 will then be 
to eruse = reference to Ecuador and Vene 
Sea ane opportunity to say wat that, as my notes are 
essa nil oe d largely upon newspaper notices, which are not 
slvays reliable, I shall be glad to receive corrections to my pub- 
lished lists from any persons who,may have better information; 
reliable notes sent me in advance. y permanent address is as 
C. G. Rockwoop, Jr., Princeton, N. J., U.S. A 
July 13, 1883. 
8. Brief notices of some recently described minerals.—Emp 
LirE: Described by Igelstrém as occurring in radiated pe 
fibrous aggregates of very minute but well-formed oleae. he 
128° to 130°; the e planes oe (Z), 120 (4-2), 130 (é- 3), 010 (i); 
o 
cleavage, serleet parallel 01 e optic axes lie in the brachy- 
diagonal section, the scuts positive bisectrix ae to the 
shorter titers! axis, 2V=85°. Hardness, about 6. Color, white, 
becoming ni es on exposure to the air from oxidation of the- 
iron. Infusible, and does not decrepitate, ste very slightly, if 
at all, attacked by ac acids. Two analyses gav 
Side Al,O3 MgO, CaO, FeO H.O 
i 51°70 31°52 4°60 12:18=100 
2. 47°86 33°60 o10 12:84==100 
These pares the author corrects for the 16 p. c. gangue intermixed, 
and obta 
"eb. Al,Os; MgO, CaO, FeO H,O 
We 
1. 62-3 30°56 34 13°8 
pi 48°8 S33 os 14°6 
The mineral is essentially a hydrous silicate of alumina, but 
owing to the impurity of the material analyzed the exact compo- 
sition must be regarded as very doubtful. It occurs mixed with 
eyanite and in cavities in schistose damourite and in quartz ; 
from the Horrsjéberg, Wermland, Sweden.—- Budi. Soe. Min., v1, 
40, 1883. 
: IcerstRéwrre, Su.rpexeirE and MANGANHEDENBERGITE are 
manganese minerals, described by Mats Weibuil, from Vester- 
be ee,’ in the Norrbirke parish, Sweden. Igelstrémite occurs 
