or THE MAGNETIC DECLINATION. 



13 



If we separate the numbers in accordance with westerly and easterly deflections 

 we obtain the following table, deduced as in the former case. It may be remai'ked 

 that on account of the separate ratios used for the interpolation of the western and 

 eastern deflections, their sum in any one month does not give the corresponding 

 number in the above table exactly, only the yearly sums having been preserved ; 

 and the same is true in regard to the table, showing the amount of the disturbances. 

 Interpolated values as before are inclosed between brackets : — 



The ratios show a general correspondence in the numbers of westerly and easterly 

 deflections ; the westerly deflections seem to occur most frequently in August, while 

 the easterly predominate in October ; the secondary maximum of either series is in 

 April. The minima remain nearly as before, one minimum of eastern deflection 

 occurring in January. 



With respect to the whole number of westerly and easterly deflections, we 

 deduce the proportional sums from the following table : — 



On account of the incompleteness of the record in the years 1840, 1843, and 

 1845, the number of eastern and western disturbances relative to the total number 

 cannot be ascertained with accuracy. They are about equal in the record. At 

 Toronto the eastern predominate over the western in the proportion of 1.17 to 1 

 (for the years 1841 to 1848), and nearly to the same extent for each year, taken 

 separately. 



The numbers in the column headed " sum" do not indicate the law of the eleven 



