441 
Galvanic Battery; and also an improved method of analyzing 
irons and steels for their contained carbon, by the use of 
bichromate of potassium: 
The wood-cut represents a trough, on which stands the battery of cups. 
A pair of tubes descend from each 
Snproved Galvanic Battery, by RE Rogers WI. cay, through the lid of trough, into 
' 5 ‘ 
each side of the diaphragm. The 
lid of the trough is made air-tight, 
by the following arrangement: A 
the under side of the lid near the edge. The groove being half filled 
with mercury, the joint is kept air-tight by the weight of the lid and bat- 
tery. An India-rubber pipe enters the trough, and the breath (or a bel- 
piece of the India-rubber tube, and the liquors fall back into the trough. 
The lid and battery can then be removed and washed. 
Mr. Lesley described the faulted structure of the district 
and another of the ores of North Carolina. 
Prof. Cope described the sightless fauna of the Mammoth, 
Wyandotte, and other Caves. 
; the liquids. The trough is divided 
: lengthwise by a diaphragm. The 
tubes of each pair descend one on 
a ; 
groove is sunk in the upper edge of 
of the four walls of the trough, and a bead to fit the groove runs round 
lows) is sufficient to cause the liquids to ascend into the cups of the bat- 
tery during work. After work, the cork is withdrawn from the mouth- 
around Embreeville, in East Tennessee; and exhibited a 
suite of European iron ores, owned by Mr. Thomas Graham, 
Pending nominations, Nos. 693, 694, 695, were read, 
And the meeting was adjourned. 
Stated Meeting, May 17th, 1872. 
Present, 18 members. 
Vice-President, Mr. Fraury, in the Chair. 
A letter accepting membership was received from Pro- 
fessor Guillaume Lambert, dated Bruxelles, Rue Traversiére, 
No. 78, April 30, 1872. 
A letter acknowledging receipt of Transactions, XIV., i.ii., 
and Proceedings, 78-85, was received from Professor Paolo 
Volpicelli, dated del Campidoglio, Roma, Reale Ace. d. 
Lincei, December 12, 1871. 
A. P. §—VOL. XII.—38D 
