( 290 



These results agree remarkably well with the results dedu- 

 ced frora my observations. In the half year from April to Sep- 

 tember, in which the greatest part of the tirst and second set 

 of ray observations was taken, the inclination decreases from 

 ï a. m. to 10 a. m , is a minimum at 10 a. m., increases 

 from 1 a. m. to 7 p. m , is a maximum at 7 p. m. and has 

 at 10 p. m. nearly the same value as at 4 p. m. 



The difference between the annual means at St. Helena for 

 10 a. m. and 4 p. m. is 2' 05; the difference at Batavia be- 

 tween the annual means for the same hours is 2'.96. By this 

 it is probable that the range of the diurnal variation at Ba- 

 tavia in the annual means is greater than at St. Helena. This 

 agrees with the results deduced by General sabine from the 

 variations of the horizontal and of the vertical force at St. 

 Helena, the Cape of Good Hope (See e. sabine, Observations 

 at St. Helena. Vol. II, pag. C and Hobarton (See e. sabine, 

 Observations at Hobarton. Vol. II, pag. XLV) ; these results 

 are contained in the folio wing Table: 



TABLE VI. 





South Latitude. 



Differences between 



the values of the 



'annual Means of the 



South Inclination 



at the hours of 



Maximum 

 and Minimum. 



St. Helena 



The Cape of Good Hope . 

 Hobarton 



15° 56' 

 33° 56' 



42° 48' 



2\57 



r.59 



1'.26 



These results indicate a decrease of the range of the diurnal 

 variation of the Inclination in the annual means with an in- 

 crease of Latitude. 



I intend to continue my observations of the inclination at 

 10 a. m and 4 p m. two days a week; my chief object in 



