Military Posts of the United States. 



279 



Average, 17.46 5.47 6.10 1.36 Fair. 



The thermometrical observations recorded in the preceding 

 tables were made at three different hours of each day, namely, 

 7'' A. M., 2h p. M., and 9^ p. m, the hours recommended by Pro- 

 fessor Dewey of Williamston, in the United States, giving, by 

 taking their mean, the mean daily temperature throughout the 

 year. According to the hourly meteorological observations 

 made at Leith-Fort, (see this Journal^ vol. v. No. ix. p. 18,) 

 the mean of the hours 7, 2, and 9> selected by Professor Dewey, 

 is about three quarters of a degree above the true mean of the 

 day ; and though the observations upon which Professor Dewey 

 proceeded were made in America, yet, as they were not made for 

 a whole year, we may be allowed to place more confidence in the 

 Leith results ; and for this reason to conclude that all the ag- 



