92 Scientific News, | January, 
He places the retina behind the basilar membrane, precisely 
where it was supposed to be by Gottsche. 
THE SAC-LIKE NATURE OF THE Wincs oF InsEcts—Mr. G. Dim- 
mock showed the two halves of a split wing of Attacus cecropia, in 
which the two layers of the wing had been separated by the follow- 
ing mode: The wing from a specimen that has never been dried is < 
put first into seventy per cent alcohol, then into absolute alcohol, 
and from the latter, after a few days’ immersion, into turpentine. , 
After remaining a day or two in turpentine, the specimen is 
plunged suddenly into hot water, when the conversion of the tur- 
pentine into vapor between the two layers of the wings so far 
separates these layers that they can be easily parted and mounted 
in the usual way as microscopical preparations on a slide. 
:0: 
SCIENTIFIC NEWS. 
—No glaciers exist in the United States but those of the Pacific 
coast, as only here the atmospheric conditions are favorable, and 
the ice-streams of Mt. Hood are the only ones on this coast 
easily reached. Down far below the snow line, great seas of ice 
push their way through valleys they have cut for themselves. 
further down; and from the wedge-shaped snout of the ice giant 
pours a deluge of water, while down its face rains a shower of — 
sand and rocks. The water assorts the debris, soon dropping the 
bowlders, carrying the coarse sand further, and bearing to the 
Columbia much of the ashy sand that is filed off by the bottom 
of the glacier—VPortland Oregonian. 
_ — Professor W. A. Rogers, of the Harvard Observatory, has 
reported to the American Academy of Arts and Sciences, in Bos- 
‘1G, Dimmock, Py: sche, May, 1884, P. 170. Z 
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