( 438 ) 



Besides we lijul hy siihtracliiiii' llic two e(|iiali(>iis: 



+ 2.58 L .T„ 4- 4.03 L A\, = -f J".7<S ± I".94 



or 

 and 



L II, -f ().()4 L --r,, = -f 0".44 ± 0' .48 



tor .T., Haxskn L R, = + ()."44 



,, Nkwcomh =-|-()."l8 



(»i' llu' sciiiidiameler corrcsiioiidiiiu' to my oUsevxatioiis docs iiol diller 

 imicli from thai of II \nsI':n. 



As (o the accuracy reached in my ol)ser\atioiis we lijid as mean 

 error of an ol»scr\ation ovei' 7 tlireads witlioul special iinccrlainly , 

 as it is dcrixed fi-om tli<' oltscrx ations of the two lind»s: 



.1/. /:. = d= 5^:]*». 



W'itli this mean ci-ror we may compare the one foujid Ity I'rof. 

 OiDi'.MANs foi- tlie anahtuoiis ohscrvations made l»y S. 11. aiul ( J. U. de 

 Lan(tK at Halavia^i and that dei'ived by Auwkrs from sex ei-al Jongitude 

 delerndnatiojis made by Flelriais hy means of moon-culnnnalions"^) 

 DK LAN(ri-, 1851—54 M. K. of 1 ol»s. d= 5^25 



Fi,Ei KiAis 1<S()7- 70 M \\. of a\erage obs. ± 3".14 



Tlie value for Kij-:lriais is the mean of the results from the obser- 

 \alions at 5* stations. In comparing these results it should be i)orne 

 in mind that the txxo inslrunienls and especially that of Feeukiais were 

 more [towerful ihau mine. ( )n the othei' liau<l it was more dil'licull 

 to deriv(> accm-ale })laces of the moon for the years 1851 — 54. 



Finally 1 shall reduce my result to the harboiirlight and to the 

 jlagstaif of the r(»sidence at Landana. \\\ means of the triangulalion 

 uieiitioned Itefore'; I found a-- dilferenci's of longitude: 

 llarbourlighl - ( )bservalion|»ier = -|- 0\2'2 

 Flagslatf - „ = — 1.48. 



Hence the longitudes from (Greenwich become: 



LoN{aTL"DK, llAKBOlRI.KfilT 48'" o2\ 1 ± F.O 



LoMilTt DI', Fl.A(iSTAFr 4<S oli. 8 i 1.0 



The Fnglish Adnni'alty-charl gives for the longitude of the harl.our- 

 li-iil 12' -S' Fast = — 4S" :V2\ 



11. I )i'irfiii'in'lfii>ii of tin' (ji'iKifii jiliicnl jxKsificii oj Mdjlili. 

 5. Mavili, a factory of the tii-m Hatton and ('ooivSon is situated 



.1) J. A. C OrnF.MANs. Ver.^lai:- van don geogia))liisclii'ii dirnsl in .Ncdrilamlsclj-lndii' 

 1858- 185^1. batavia ISGO. 



') Astion. Nac.lir. Hd. lOS, p. 813. 

 3) Conli-ibuUuns 1 p. (287) li. 



