386 McGee—Meridional Deflection of Ice-Streams. 
five lay farther from the line than can be ascribed to error of 
observation. In some of the irregular cases the composition 
of the glass is almost identical with some of those that lie on 
the curve. ith one exception the departures are less than 
the maximum differences afforded by the depressions observed 
by Dr. Weber on a single thermometer. These latter, for ex 
Depression of zero corresponding 
to 100°. 
3 4 5 q 
Ratio of Potash to Soda. 
ample, amount to 021°, 0°29°, 035°. May it be that for cer- 
tain proportions of soda and potash the depression becomes 
less regular? The single remaining exception, the only case 
where the depression is decreased, is unique in having the lime, 
soda and potash in nearly equal amounts. The Commission 
still continue the investigation. 
Art. LI.—On the Meridional Deflection of Ice-Streams ; by 
W. J. McGus. 
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tell of their magnitude and of their movements.* : 
The lateral moraines of four of the glaciers extend far ae 
the plain in which the lake is embosomed; while those of t ' 
fifth terminate on a narrow plateau bounded lakeward by ® 
se and other moraines are described in detail by Mr. I. ©. Russell ver 
whose direction they were observed he writer), in his memoir on the bee 
nary history of Mono Lake, designed for publication in the forthcoming 
Annual Report U. 8. Geological Survey. 
