THE SUN S MOTION IN SPACE. 159 



tion was as follows : — The angles xp made by the P.M's. with 

 circles of declination were first computed, and then, assuming a 

 point Q for the direction of the solar motion, the angles x//' which 

 the stars's path made with the meridians thereof, were also calcu- 

 lated. The value of \p' was differentiated on the supposition that 

 the R.A. and D. of Q are variables. In the resulting expression 

 the value of the differences of \p and \p' were substituted for dip', 

 and thus an equation was obtained in which there are two undeter- 

 mined quantities dA say, and dD. These equations on being 

 solved by the method of least squares, gave values to be applied 

 as corrections to the assumed values of the R.A. and D, of Q. The 

 successive application of this process with recomputed values of 

 R.A., D. and \p' gave that position of Q which most nearly repre- 

 sented the whole of the observations. 



(26) Struve, F. G. W. von, 1837.— A report by Struve on 

 Argelander's work appeared in the Bulletin of the St. Petersburg 

 Academy of Science in 1837, 1 and some correspondence between 

 him and H. C. Schumacher, the founder of the Astronomische 

 Nachrichten, also took place, in the same year, 2 relative to the 

 solar motion. 



(27) Wartmann, L. F., 1837? — In the same year also, an article 

 was contributed by Wartmann to the Society of Switzerland, on 

 the general motion of translation of our whole system in space. 



(28) Taylor, T. G., 1838}— The Madras Literary and Scientific 

 Journal for 1838 contained a reference to the solar motion in 

 space by Taylor of the Observatory of that place. 



1 Rapport sur le memoire de P. Argelander : Ueber die eigene Bewegung 

 des Sonnensystems hergeleitet aus den eigenen Bewegungen der Sterne. 

 Petersb. Bull. Scient. Acad, n., 1837, pp. 113, 129. 



2 Auszug aus einem Sohreiben an H. G. Schumacher, Astr. Nach. xiv., 

 1837, 315; Bibliotheque universale de Geneve (2) x., 1837, 161. 



3 Sur le mouvement general de translation de tout Tensemble de notre 

 systeme solaire. — Soc. Helvet. Act., 1837, pp. 71 - 74. 



4 Eesult of astronomical observations made at the Madras Observatory: 

 Motion of the Solar system in space. — -Madras Journ. Lit. and Sci., (1) 

 vii., 1838, pp. 387 - 399, 479. 



