APPENDIX. 533 



for which purpose a sympiesoineter is equally good, and 

 more sensitive. 



For the gale of 1840, the register of a barometer is shewn, 

 which, although 0.2 too low, will serve to shew the effect upon 

 the mercury. 



At Swan River, on the 24th of May, 1838, the wind was 

 strong and squally from N.E. by N. ; sympiesometer standing 

 at 30.74. During the day the oil commenced to fall, and conti- 

 nued falling slowly until the 30th, whezi it was 30.16 ; during 

 the greater part of this interval, the winds were light, gene- 

 rally from some eastern point in the morning, and going 

 round the compass, by north and west, during the day ; the 

 nights were mostly calm, a heavy bank of clouds was collect- 

 ing between N.N.E. and S.W. and the whole western horizon 

 had a gloomy appearance. On the evening of the 3l)th, the 

 water had risen considerably at the anchorage, and the stream 

 ran to the southward ; a fresh breeze also set in from N.E. 

 and gradually veered to the northward, as it increased in 

 strength. On the 31st it blew hard all day, between N.N.E. 

 and N.N.W., with dark squally weather, much lightning in 

 S W. and heavy rain, that continued all night. On June the 

 1st, the gale was at its height, and at 8 a. m. (the sympie- 

 someter having fallen to 29.93) was blowing a hard gale, with 

 heavy squalls and rain, from N.W. ; towards noon the wind 

 veered to west, but still blew very hard ; the sympiesometer 

 now began to rise, and in the evening the wind was W.S.W. 

 and had moderated considerably, the weather was also clearer, 

 although heavy clouds still hung on the western horizon. 



The next morning, (the 2iid) the sympiesometer had risen 

 to 30.26 ; but this was much too sudden a rise, (0.33 in 24 

 hours) to allow us to suppose, that the favourable change in 

 the weather was to be of long continuance ; during the day 

 the oil began to fall again, and the wind veered to W. and 

 N.W. and on the 3rd blew harder than ever, with heavy 

 rain, thunder, and lightning j and, with the exception of ccca- 

 sional intervals, when the wind moderated, this weather cou- 



