BY JOHN TEBBUTT, JUN. 155 



supplement the efforts of the government. There is, too, another 

 disadvantage attending any operations here, but it is one which 

 might easily be remedied. A little more care in the preparation, 

 or publication, of the telegraphic weather reports is necessary. 

 Their frequent inaccuracy is an evil, which is the more serious, 

 on account of the fewness of the stations. Where the places of 

 observation are numerous, and therefore not so widely separated 

 from one another, an accidental error in a report from any one 

 station is easily detected by comparing it with the reports from 

 the other stations in its immediate vicinity. 



My present object is to lay before the Society a series of 

 diagrams, which I humbly hope may throw some light on the 

 manner in which barometric changes are propagated over the 

 Colonies. The area of the Colony of New South Wales being so 

 limited, and the observations at seven out of the nine meteoro- 

 logical stations being made only once a day, it is obviously 

 impossible to trace any atmospheric disturbance with satisfaction. 

 This difficulty is especially obvious if the movement of the dis- 

 turbance be from west to east, because the stations differ so little 

 in longitude. The observatory at Adelaide is then of great im- 

 portance in the solution of this question. Its distance westward 

 from our own Colony is sufficiently great to enable us to detect any 

 deviation from actual synchronism of barometric changes. Mr. 

 Todd has kindly supplied me with his observations made at the 

 Adelaide Observatory, during the years 1861 and 1862. I have 

 employed those for 1861, together with the observations made at 

 Deniliquin, Sydney, and Brisbane, for the same year, in laying 

 down the barometric curves appended to this paper. The curves 

 for Adelaide and Sydney have been projected from the 9 a.m. 

 observations at those places ; the Brisbane and Deniliquin curves 

 are copied from those contained in the Volume for 1861 of the 

 Sydney Astronomical and Meteorological observations. No 

 corrections have been applied to the observations for difference 

 oflongitude or height above sea level, as such corrections would 

 not materially affect, the conclusions to be arrived at. The 

 diagrams require very little explanation. The vertical lines 

 represent the days of the month, and the horizontal ones the 

 heights of the barometers at the four stations. The vertical lines 



