Geology and Natural History. 383 
high. The air is conveyed in a similar tube, and the character of 
the sound will vary according to the part of the flame struck, the 
pressure of the air and the ratio of the diameter of the tubes. 
hen the jet of air, striking the flame near the top, gradually 
descends to within about a decimeter of the orifice, we see the 
column of flame first divide, lower itself, then twist under the jet, 
envelop it and let it pass, surrounding it with a blue veiag ite 
The experiment also succeeds well with a Bunsen burner, after 
closing the air holes. It is needless to add that no sound is pro- 
the chemical action of the air.— Comptes Rendus, Ixxx, 1602. 
mm 0. 
IL GroLtoey anp Narurau Hisrory. 
_ l. Evidence of glacial action upon the summit of Mt. Wash- 
ington, N. H—Prof. C. H. Hr : 
details of the discovery of transported bowlders upon the summit of 
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the ledges, has been transported by the glacial hot Ma 
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Which cannot be distinguished lithologically from those that may 
ve been transported a considerable distance. Most of this 
angular debris is so far removed from existing ledges that frost 
