THE SUN'S MOTION IN SPACE. 199 



motions were determined from observations, differently weighted, 

 at five epochs, the series being, — 



I. Lacaille, Bradley : II. Piazzi : III. Johnson St. H., Cape 

 1840, Taylor, Henderson, Pond : IV. Cape 1880, Cordova 1875, 

 Melbourne (i.) and (ii.), Greenwich : V. Recent observations at 

 the Cape and Cordova. The catalogue gives the places for 1850*0. 

 The celestial surface was divided by 2-hour circles, and by parallels 

 of declination into 122 equal areas, and the general treatment 

 was similar to that in the 1894 treatise. 213 poles whose un- 

 certainty lay within the previously indicated limits gave for the 

 pole of the parallactic equator the coordinates — 

 (213 stars) R.A. = 274*°4, D. = + 0*°4 



Combining this catalogue with the previous one, thus bringing 

 the total number of stars employed up to 1579, the result became 

 (1579 stars) R.A. = 268*°3, D. = - 2-°9 



Again, on dividing the whole sphere in 122 equal trapeziums, 

 (2 calottes at the poles), the result obtained was 



R.A. = 269*°7, D.= -0-°02 

 the close agreement of both results shewing that the unequal 

 division of the celestial sphere by the stars employed, had not 

 materially influenced the result. Kobold also, employing the list 

 of 11 stars referred to previously, viz., in his 1894 treatise, whose 

 parallaxes and motions in the line of sight have been determined, 

 found that they pointed to the result 



R.A. = 240*°1, D. = + 3*°7, V. = 2-53 Ger. miles per sec. 

 Derived from such limited data, this result could not of course be 

 regarded as having much weight, but the close agreement with 

 the general result is worthy of remark. The epoch for all the 

 values is 1810-0. 



(112) Kobold, 1897 (April). — In a contribution concerning the 

 value of the precession-constant, 1 Kobold assigned, for the epoch 

 1810*0, as approximate values of the parallactic pole R.A. 270°, 



1 Ein Beitrag zur Kenntniss der Praecessionsconstaute. — Astr. Nach., 

 Bd. cxliv., pp. 57 - 60, 1897. 



