410 On the Cyclones of Tasmunia, ce. 
the wind increasing in force from 1 to 5, 6, 7, 8 on the 9th, 
and veering from E. to N.E. By supposing the upper Cyclone 
to have moved. a little towards the E.S.E., it will be easy to 
trace the origin of the strong S.W. gales encountered by the 
Zone and Thomas Lord to the North of Sydney, after the 
13th August. 
The reading of the barometer at Melbourne at midnight 
of the 8th August is 27°38, showing a fall of two inches in 
the preceding 24 hours, and there is a rise of two inches 
during the following day. If this is not an error of the 
press, 27 being printed for 29, such a great and sudden fall 
and rise would indicate that the very centre itself passed over 
Melbourne, which seems probable from other considerations. 
The supposition of the passage of two successive Cyclones 
in the tracks which have been assigned to them will be found 
to explain all the meteorological phenomena that have been 
here recorded. No false theory could bear the application 
of such a host of independent tests without betraying dis- 
crepancies or contradictions. 
Each of the Cyclones just investigated may be regarded 
as the type of a class to which Bass’s Straits are obnoxious. 
The first producing the well-known gales described by Flin- 
ders 40 years ago, which changed from N.W. to 8. and 
S.W.; and the second those which change from N.E. to E. 
and 8.H. 
It is gratifying to be able to confirm, by such good and 
conclusive evidence, the suggestion hazarded by Mr. Pid- 
dington, one of the best writers on Oyclonology, and 
certainly the best. teacher of the practical application of 
the art. 
