DISTURBANCES OF THE TOTAL FORCE. 



11 



The ratios of the increasing and decreasing disturbances appear to follow the 

 same law, that is, the values at any hour appear to be complementary to one another, 

 a high plus value corresponding to a low minus value ; the phenomenon is, however, 

 not so distinctly brought out as from the longer series at Toronto. The last two 

 columns contain the difference of the sums at each hour, and the average effect of 

 the larger disturbances of the total force. From 1 P. M. to 1 A. M. the larger dis- 

 turbances augment the total force ; from 1 A. M. to 1 P. M. they diminish it ; 

 greatest augmentation at 2 P. M., greatest diminution at 4 A. M. The greatest 

 augmentation is nearly twice as great as the greatest diminution, whereas at Toronto 

 the opposite effect was observed. 



The distribution of the disturbances of the total force, according to their magni- 

 tude for an equal increase of .00090 parts of the force, is as follows : 



