DISTURBANCES OF THE TOTAL FORCE. 



The ratios of the mcreasing disturbances of the force have a double progression, 

 as have also those of the decreasing disturbances, though not so well marked. In- 

 creasing disturbances show a principal maximum in January, a principal minimum 

 in June, and a secondary maximum and minimum in August and November, 

 respectively; decreasing disturbances show a principal maximum in January, a 

 principal minimum in October, and a secondary maximum and minimum in Septem- 

 ber and May, respectively. It appears, therefore, that upon the whole we observe 

 the same laws as at Toronto, viz : the disturbances increasing the force and those 

 decreasing the force follow the same progressive monthly change, and exhibit 

 maximum values about the equinoxes, and minimum values about the solstices. 

 This last remark also applies to the results of the following table in which the 

 annual inequality of the disturbances is given irrespective of sign. 



Table VIII.— Aggregate amount and number of Disturbances op the 

 Total Force in each Month and Ratio of Sums. 



July . 



August . 



September 



October 



November 



December 



January 



February 



March. . 



April . 



May 



June 



Sum. 



.013387 

 0.12132 

 0.16101 

 0.07301 

 0.10659 

 0.19930 

 0.24797 

 0.18620 

 0.19576 

 0.17646 

 0.15161 

 0.( 



115 



58 

 87 

 146 

 176 

 140 

 154 

 129 

 94 



Ratio, 



0.87 

 0.79 

 1.05 

 0.47 

 0.70 

 1.30 

 1.62 

 1.22 

 1.28 

 1.15 

 0.99 

 0.56 



Table IX. — Aggregate amount and number of Disturbances op the 

 Total Force in the different Years op Observation. 

 The ratios of the sums exhibit part of the eleven year inequality. 



Tear. 



Sum. 



n 



Ratio. 



1841—1842 



1842—1843 



1843—1844 



1844—1845 



.78836 

 .51657 

 .32798 

 .20499 



558 

 379 

 272 

 156 



1.72 

 1.13 

 0.71 

 0.44 



The minimum of the eleven year period, according to the above ratio, occurred 

 probably in 1845. 



December, 1864. 



