358 C. G. Roekwood—American Earthquakes. 
which agrees very closely with that required by theory for the 
formula MnW0Q,,. 
This mineral is also found in a mine near Meatinggat 8: Mon- 
tana Territory, according to Mr. Richard Pea The speci- 
_ mens in the collection of the Colorado Scientiin. Society show 
large flattened crystals of imperfect form in quartz. Mr. A. H. 
ow, Chemist at the Boston and Colorado Smelting "Worcs 
has analyzed the mineral approximately and found— 
aa 74°82 
ee a, ee ee 25°00 
POO ee ee ie SE eee 0°06 
99°88 
Art. XLII. — Notes on American Earthquakes: No. 18; by 
Professor C. G. Rockwoop, Jr, Ph.D., Princeton, N. J. 
Tus article, the thirteenth in the series, embodies such 
America and the adjacent islands, during the year 1883. The 
information has been derived from the current news apers ; 
from the Monthly Review of the U. S. Signal Service; and 
from Professor F. E. Nipher, Director of the Missouri Weather 
Service; Charles Carpmael, Superintendent of the Canadian 
Meteorological Service; and J. M. Batchelder of Cambridge, 
Items which are regarded as doubtful are, as heretofore, 
printed i in smaller type; and in many cases the source of the 
information is indicated. Also, to avoid tne danger of con- 
founding a.m. and p.m. dates, ‘the system of numbering the 
hours of the aivil ay from one to twenty-four has been pete 
1883. 
- 1.—At 2° 58™ bee 8" 28™ two earthquake shocks at Addi- | 
Rev 
Jan 
son, Me—J. 8, Wea 
A shock in other es of Wine and Nova Scotia about 22" on 
the aH Abge ies day was noticed in the last report (this J ournal, XXV, 
60). 
ae an. . — Betw he 25 and 3% a shock was wernt to have been felt in northern 
Ohio.—N. Y. Tim 
Jan. 9.—At 3 a shock from east to west at Huntingdon, Ont.— 
Ooaadtin Meteorol. Serv 
é 
15 oa 2h a decided shock was felt ites a 
to Memphis 
Jan. 11.—Between 
the Midsisipp; ae from St. Louis, Mo., t- 
