( 285 ) 



The second set comprises observations made at 10 a. m., 4 

 p. in. and 10 p. m. on 21 days from August 26, 1868, to 

 November 3, 1868. In the beginning of November I grew se- 

 riously ill, so that it was impossible for me to make any ob- 

 servations; it was December when I had so far recovered that 

 I could recommence them. 



The third set comprises observations made at 10 a. m. and 1 

 p. m. on 103 days from December 1, 1868, to November 30, 

 1869; these observations were made if possible two days every 

 week, so that 8 or 9 days of observation feil in every month. 



Table I contains the first set of observations. The inclination 

 is South 27° -j- the numbers in the Table; these numbers in- 

 dicate minutes. 



TABLE I. 



Batavia 

 Mean Time. 



7a.m. 



8a.m 



t.m. 



10 

 ,. m. 



11 

 a. m 



Noon 



Ip.m. 2p m 3p.m.|4p.m, 



•p.ra. 



May 29. . . . 

 Juiie 4 . . . . 

 June 12 . . . 

 June 19 . . . 

 June 25 . . . 

 July 2 . . . . 

 July 9 . . . . 

 July 16 . . . 

 Jaly 23 . . . 

 July 30 . . . 

 August 13 . . 

 August 22 , . 

 Hourly Means 



22'.54 

 20'.05 

 19'.58 

 19M6 

 19'.04 

 17'.58 

 20'.32 

 2P.72 

 20\37 

 17'.88 

 ?0'.73 

 22'. 04 

 20'.08 



20'. 5 6 

 20'.23 

 19'.82 

 17'.81 

 19'.58 

 19'.6? 

 18'.94 

 20 '.30 

 18'.42 

 18'.64 

 22'. 03 

 20'.58 

 .67 



19'.97 

 18'.27 

 19' 46 

 L7'.91 

 19M8 

 18'.22 

 20'.59 

 L7'.97 

 15'. 57 

 18'.99 

 22'.79 

 21 '.13 

 19'.17 



19M7 

 17 / .53 

 17'.79 

 18'.3; 

 17'.78 

 17 '.04 

 19'.71 

 19M7 

 16'.93 

 19M9 

 21M0 

 19 '.49 

 18'.60 



18'.63 

 19'.20 

 lb'.55 

 18'.81 

 18'.S4 

 17'.73 

 20'.27 

 18 '.03 

 19'.03 

 19'.00 

 21 '.67 



19'.94 

 18'.37 

 17'.71 

 19\37 

 18'.93 

 '6' 97 

 19'.03 

 20'.41 

 19'.80 

 19'.07 

 20'.67 



19'.0618'.42 

 19.'0719'.06 



21'.51 



18'.68 



19'.12 



20'.04 



19'.44 



18'.42 



19'.97 



20'.34 



21 



18'.97 



20M4 



19' 92 



19'. 80 



19'.94 

 18'.84 

 19'.2 

 20'.25 

 18'.82 

 19':ï2 

 22M9 

 2()'.99 

 20'. 74 

 18'.93 

 22'.01 

 19' 36 

 O'.IO 



:0'32 

 18'.82 

 21'.69 

 21 '.40 

 20'.31 

 18'.9h 

 22', 34 

 20'. 8 

 21'.78 

 20' 12 

 23'.26 

 17'.70 



0'.63 



::0'.90 

 20'.29 

 21'.48 

 20'.23 

 19'.64 

 19'.29 

 23'.9S 

 •11 '.46 

 23'.34 

 21'.03 

 22'.32 

 19 '.92 

 21'. 16 



22 '.05 

 20'.4S 

 23' 64 

 20'.60 

 20'.29 

 19'.29 

 24' 89 

 i0'.88 

 23'.42 

 21'.4S 

 21 '.76 

 20'.84 

 21 '64 



The hourly means deduced from these observations show that the 

 South inclination at Batavia decreascs from 7 a m. to 10 a. m., i^ 

 a minimam at 10 a. m. and increases from 10 a. in to 5 p. m. 



Table II contains the diflerences wich are found, when the 

 value of the dip at 10 a. m. is subtracted from the value of 

 the dip at the other hours 



