310 Scientific Intelligence. 
9893, -9865, ‘9868, and Mr. Glazebrook’s is "9866 or the mean of 
Lord ‘Rayleigh’s results. He also ig tea age that the Cavendish 
laboratory, Cambridge, would soon be a position to test and 
certify any resistance coils sent there. G. Lippman proposes an 
electrodynamic method for the determination of the ohm. This 
resembles Loreng’s metho coil is spun inside a long coil 
nd g al 1 EK 
Britain du uring ‘successive eras from the “Lau rekitiane” until the 
era of submergence after the era of che great glacier. They make 
a highly instructive series, interesting to the general geologist as 
much as to the European, The maps are accompanied by forty 
pages of text reviewing the facts which the maps illustrate. On 
: abs ae in N. Wales, ete. which followed, represents the British 
an archipelago, Ireland about five-sixths water, England 
pis fifths, and Wales and Scotland less than two-thirds; and that 
of the so-called Upper Glacial, or epoch of sub-glacial conditions, 
as about a fourth less under water than in the area of greatest 
ae hea 
2. Th e Geological Survey of Pennsylvania.—The following 
volumes have recently been issued. The pci of poleyeee an 
Fulton Counties, by J. J. Srevenson. No. T2, pp. 8vo 
with two maps. Harrisburg, 1882. The Geol a ao Pike and 
Wonree Counties, by I. C. Wurrre; and Special bedi de a ov 
Delaware and Lehigh Water Gaps, by H. M. Cu , 
40 vo; with colored geological maps, a pute of pe 
scratches and sections, me r. White’s Report. 1882. 
The Geology of Ph iladelphia County and or the southern 
parts of Montgomery and Bucks ; 3 by Cuartes E. Hutr with 
analyses 2 rocks, by Dr. F. A. Gents and F. A. Gents, Jt. 
No. C6. 146 pp. 8vo, with a colored geological map. 1881. 
A rhe notice is deferred. 
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