382 Dr BREWSTER on the Register of the Thermometer kept 



following Table, which shews the relation between the mean 

 temperature of each hour and that of the whole day : 



1825. 



2.296 



2.478 



2.746 



2.975 



2.976 



2.637 



2.017 



1.206 



0.244 

 + 0.840 

 + 1.747 

 + 2.520 

 + 2.904 

 + 3.206 

 + 3.230 

 + 3.105 

 4- 2.830 

 + 2.264 

 + 1.505 

 + 0.404 



0.456 



1.031 

 1.537 



1.937 



Mean of 

 1824 & 1825. 



2.133 



2.334 



2.578 



2.818 



2.873 



2.613 



1.983 



1.238 



0.212 

 + 0.745 

 + 1.683 

 + 2.510 

 + 2.882 

 + 3.203 

 + 3.265 

 + 2.972 

 + 2.605 

 + 2.027 

 + 1.277 

 + 0.357 



0.438 



0.990 



1.463 



1.868 



From this table, it appears, that the mean annual tempera- 

 ture of any hour of the day never differs more than 3| from the 

 mean temperature of the day for the whole year. It deserves 

 also to be noticed, that the deviations in the year 1825 are uni- 

 formly greater than those in 1824, which no doubt arises from 

 the former having been a much warmer year than the latter. 



In order to obtain the mean temperature of the year from a 

 register which contains observations made only once every day, 

 we have only to correct the mean temperature which the regis- 



