VIII. Meteorological Abstract/o/- /Z>i? Years 1797, 1798, 

 and 1799. Communicated by John Tlayfair, F. R. S. 

 Edin. and Profeffbr of Mathematics in the Univerfity of 

 Edinburgh. 



[Read at the Meetings in fan. 1798, 1799, & 1800.] 



IN drawing up .this abftrad, I have fomewhat enlarged the 

 plan followed in thofe formerly communicated to the So- 

 ciety. In order to reprefent more accurately the progrefs of 

 the feafons, every month is here divided into three parts, and 

 the ftate of the barometer and thermometer is given for each 

 of thefe divifions. 



In the tables, therefore, that follov,', the firft column contains 

 the greateft height of the barometer for each of the above divi- 

 fions ; the fecond the leafl: ; the third the mean ; and the fourth 

 the temperature of the air in the room where the barometer is 

 kept ; the fifth and fixth columns fhew the greateft height of 

 the thermometer in the air that was obferved during the ten 

 days to which the numbers refer; the next thi-ee give the mean 

 heights as obferved at three different times every day, viz. at 8 

 in the morning, lo in the evening, and, as nearly as can be judg- 

 ed, when the day is warmefl, that is, fome time between mid-day 

 and 3 in the afternoon. The mean of all thefe three is taken 

 for the mean temperature of the day, which being computed 

 for each day, the mean of all thefe mean temperatures is fet 

 down as the medium temperature of the air for every one of the 



thirtv-fix 



