1877.] 



Range of Magnetic Declination. 



105 



and the mean of the whole 16 years for the same point. For instance, 

 the monthly value corresponding to Feb. (0) 1866 is -3535, while the 

 normal value for the whole 16 years for this point is (by Table I.) -385, 

 and hence the proportional value of the range for Feb. (0) 1866 is 



1000 x = 918. Bv these means it is believed that the results of 



•385 J 



Table II. are freed from any recognized inequality, depending either on 

 the month of the vear or on the relative position of the sun and moon. 



