THE ~ 
TASMANIAN JOURNAL 
OP 
natural science. 
Art. I. On the Occurrence of Atmospheric Deposits of 
Dust and Ashes; with Remarks on the Drift Pumice 
of the Coasts of New Holland. By the Rev. W. B. 
Clarke, M.A., F.G.S., C.M.Z.S., Associate of the 
Meteorological Society of England, &c. &c. 
In the course of an inquiry into the origin and phe'no- 
mena of hot winds, which I have recently undertaken, 
it was necessary to consider as fully as possible the 
general direction of the great currents of the atmosphere, 
especially such as flow apparently in circuit courses at 
great heights above the surface of sea and land. 
The indications of these currents are but few : clouds 
seen in motion ; the experience of aeronauts and moun¬ 
tain-scalers ; the transportation of ashes and dust to 
considerable distances from their ascertained or probable 
local origin. 
Some curious facts came before me, and amongst 
VOL. i. no. v. 
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