NO. 17.] 



TEMPERATURE OF THE AIR. 



403 



28, the maximum temperatures have been taken from the corrected thermograph- 

 curve. 



The tables give the mean temperature of each day, being the mean of the 24-hourly 

 temperatures in the horizontal rows, and the monthly means for each hour being the 

 means of the vertical columns. The mean for the whole month stands as the mean 

 of the numbers in the vertical column headed Mean, or of the numbers in the hori- 

 zontal row of means. The hourly means have been corrected in the usual way 1 for the 

 change due to the variation from the beginning to the end of the month, and reduced 

 to Noon, in order to render them representative of the true diurnal period. The 

 corrected temperatures are given in the tables as "Corr." The last horizontal row gives 

 the difference, "hourly corr. mean minus monthly mean", headed D. f. m. (Difference from 

 mean) for each of the 24 hours. This series represents the diurnal period as it is educed 

 from the observations. 



1 H. Wild. Die Temperaturverhaltnisse des Russischen Reiches. Erste Hftlfte p. 9. 

 1893. OCTOBER. TEMPERATURE OF THE AIR. C< 



