Geology and Mineralogy. 407 
6. On a new Temperature-regulator.— Loraar Mryer has 
devised a modified form of temperature-regulator which is ex- 
lower end of which rests upon the end of the glass rod. Since 
the expansion of glass is only about half as great as that of brass, 
the outer end of the lever is moved down as the heat rises and 
up as it falls. To this arm of the lever, and adjustable as to 
distance, is hung by me f a chain, an apparatus like the 
upper part of a Kemp-Bunsen regulator. T S passes na 
II. Grotoagy AnD MINERALOGY. 
1. Geology of the Panther Creek Basin or eastern end of the 
Pens son Oy 9 URNER. 208 pp. 8vo, with an 
A rtance, he sec- 
tions have much geological interest as illustrations of the subject 
of Hexures in rocks. We here reproduce one of them, but much 
reduced in scale and with the omission of the statements as to the 
kinds of intervening strata and the parts of the coal beds that have 
: EK’, a 
outcrops of the “Mammoth bed,” 13 to 27 feet thick; F to F, of 
the overlying Red Ash coal bed, 8 to 23 feet thick. The whole 
An. Jour. Sct—Turep Surtes, VoL. XXVII, No. 161.—May, 1884, 
27 ‘ : 
e 
