598 



DR. GOLDSCHMIDT ON THE OBSERVATIONS 



must not be taken as the general mean ; but we must revert to 

 the squares, and take the square root of their ai'ithmetical 

 mean. The results of the last three years, calculated in this 

 manner, and expressed in seconds, are contained in the follow- 

 ing table. 



Mean Fluctuation of the Declination during the three years 

 from 1837 to 1840. 



The following table contains the mean values of the fluctua- 

 tions for the several months of the intervals 1834 to 1837, 

 1837 to 1840, and of the whole interval 1834 to 1840. 



In the means deduced from the six years, there are nine 

 cases in which the foi'enoon fluctuation is greater than that of 

 the afternoon ; in one instance they are equal ; and in two the 



