WHOLE VOL. 



NOTES. EUROPE 5^ 



The means were reduced to the means of 24 hours by the aid 

 of 25 years of hourly observations at Copenhagen. 



The observations at " Rundetaarn " were reduced to the 

 station Botanisk Have by the help of 5^ years of 

 simultaneous observations, and these observations 

 together with those at Botanisk Have were reduced 

 to the station " Landl^ohdjskolen " by the help of 

 14^ years of simultaneous observations. 



For further information in regard to these reductions 

 see " Meteorologiske Observationer ; Kjobenhavn, 

 bearbejdede af v. Willaume-Jantzen, Kjobenhavn, 

 1896." 

 Precipitation. 

 Site: 



Sept. I, 1820 to May 31, i860— Botanical Garden. 



June T, i860 to Dec. 31. 1920— Agricultural high school. 



GERMANY 



BERLIN 



Pressure. 



Hours: From 1881 to 1886 observations were taken at 6^, 14*^ 

 and 22^' and from 1887 to 1920 at f\ 14^ and 2i'\ The 

 means are obtained from these observations divided by 3. 



Temperature. 



Hours: The means were derived from the following combina- 

 tion of hours: from 1769-1786, i{y^+i4i^ + 22^') in sum- 

 mer and ?s(8'i4-i4i''-h22'') in winter; from 1787 to 1821, 

 ^^ ( gh -I - 1 311 + 23'') ; f rom 1822 to 1 840, i ( &' + 14'' + 22^ + 

 2^) ; from 1841 to 1847, \ (max.-{-min.) reduced to \ 

 (6'"' -I- 14'' + 22'^) by means of simultaneous observations; 

 from 1848 to 1886, i(6'^+i4'' + -'-2'0 ; ^^'O'" 1^87 to 1920, 

 i(7i^-M4'^ + 2i'' + 2i'^). 

 Homogenciiy: A detailed study of the homogeneity of the Berlin 

 temperature observations was made by Dr. Hellman and 

 published in " Das Klima von Berlin," Kgl. Preuss. Meteor. 

 Inst., Bd. HI, Nr. 6. The mean values from 1787 to 1821 

 were taken from the original. 

 Errors: The values from 1805 to 1817 are slightly too low. From 

 1873 to 1883 they are about 0.02 C. too high and in 1887 

 about 0.02 C. too low. 



