306 J. W. Mallet—Barcenite from Huitzuco, Mexico. 
dust settled to the amount of several hundred pounds a day. 
n explosion in this conductor, communicating flame to the 
dust-house, would scarcely fail to cause the successive explo- 
sions of the dust-house and the different stories of the mill, the 
and that “dry stones can hardly be avoided by any amount of 
foresight,” appears to be generally sntorsnrnea illwri 
companies ; a number surprisingly large if confined to those 
occurring in the States of Minnesota and Wisconsin within a 
few years past. The remedy in such cases is so obvious that 
the most ordinary care and intelligence is sufficient. 
University of Minnesota, Minneapolis, June 30, 1878. 
Art. XXXV.—On Bércenite, a new Antimonate, from Huitzuco, 
Mexico; by J. W. MALuet. 
AMONG some Mexican ores given me by my friend, Seiior 
Mariano Barcena, one of the Foreign Commissioners to the 
a, 
Philadelphia Exhibition of 1876, and now Director of the Cen- 
were several specimens of a heavy, nearly black mineral, which 
accompanies Livingstonite* at Huitzuco in the State of Guer- 
* Sulphide of antimony, mercury and iron: described Bércena himself 
(Naturaleza, 1874 and till (= 35 and 172). : Sulphur, Pa Bocce stibnite and 
valentinite are said to be found at the same locality. 
