( 118 ) 



We tlieii find as mean correction of 



Germain's longitude: — 2^15 =b 0^79 (mean error) 



the supplementary correction according 



to AuwERS is for 1874,80 : + 2^71 ± 0^,50 ') 



and the final correction is -}- 0%56 ± 0%93. 



Although our calculations were somewhat modified and a systematic 

 correction was applied, which seems to be required, we arrive at 

 the same conclusion as in our first paper, ^ iz. that the correction of 

 the longitude of St. Denis found by Germain, in so far as we may 

 judge from the occultations observed by us, is very small. If we 

 pay attention to the mean error of our result, it is not even certain 

 whether it is negatixe or |)Ositive, though there is a greater proba- 

 bility in favour of a small positive correction. 



hi my previous paper I have not mentioned that the reduction 

 to 1874 of the places of the stars from all the available catalogues 

 has been very carefull}^ executed bj' Mr. H. Kress, "amanuensis" at 

 the Observatory at Utrecht. The derivation of the most probable 

 places from the whole material I have made mjself. 



It will be interesting to record that the meridian observations of 

 the moon, made at Leyden in Sept. and Oct. 1874 by Mr. H. Haga, 

 then assistant at the observatory (now professor of physics at the 

 university of Groningen), has yielded the following corrections of the 

 places in the Nautical Almanac, previously corrected according to 

 Newcomb's Investigation: (see table p. 119) 



Ï) This mean error has been esliniated, and is based on the argument that the 

 vakie of the correction, which was found by grapliic compensation, rests on about 

 25 occultations, while Auwers has arrived at the result (^.iS''. i^c?. 110, co/?«n» 336) 

 that one disappearance at the dark limb yields a longitude, of whicli the mean 

 error may be considered to be ± ^'^,h. 



