182 



EIGHTH REPORT — 1838. 



proportion to the error of observation, that the resulting pro- 

 bable error is but slightly diminished by the multiplication of 

 the observations. 



The following are the results of the calculation : 



L = 1-0252, M = + -000095, N = + -000058 ; 

 ?/= - 31° 20', r = -000111; 

 tlie central station being the same as before. 



Captain Ross's observations of intensity (according to the 

 statical method) were made in the autumn of the year 1838, 

 with two needles designated as R L 3 and R L 4. They are 

 contained in the following Table. 



Table LXXVII. 



