198 G. H. KNIBBS. 



The middle value of the first two, viz., 



R.A. = 275°5, D.= + 14-°0 

 is exactly the mean between Kobold's value —3°, and Ludwig 

 Struve's +31° according to Airy's or Argelander's method, and is 

 moreover the most probable result. 



(109) Kobold, 1896 (July) — Among the proper motions of 499 

 southern stars, communicated to Kobold by Auwers, the uncer- 

 tainty of the directions of 188 were within the previously indicated 

 limits. 1 These gave for the sun's apex at 1880*0 — 



R.A. = 276-°0, D.= + 2<°9 

 Treating these in the same way as the previous stars, by dividing 

 the celestial sphere into equal areas, the result was 



R.A. = 269-°3, D.= -0-°l 

 and combining these with previous results from Bradley's stars 

 this result became 



R.A. = 266-°5, D.= -3-°l. 



(110) Newcomb, 1896 (Dec. J — In a paper "On the solar motion 

 as a gauge of stellar distance, 2 Newcomb concluded from a discuss- 

 ion on the relation between magnitude and proper motion, that 

 the parallactic-displacement effect of the solar motion diminishes 

 less rapidly with stars of fainter magnitude than has been 

 supposed. 3 His result shews solar motion toward a point R. A. = 

 297°, the quantity 0*"046 per annum from the mean distance of 

 stars of 9th magnitude. If we accept for the parallax the value 

 0-"106 (2~f, see Kapteyn (122) hereinafter, this will make the 

 velocity 28-9 miles per second. 



(111) Kobold, 1897 (April)— In April 1897 Kobold discussed 

 the proper motions of 523 southern stars, 4 by way of extending 

 his 1894 investigation previously referred to. These proper 



1 Notiz betreffend die Bestimmung des Poles des parallaktischen 

 Aequators. — Astr. Nach., Bd. cxli., pp. 421 - 422, 1896. 



2 Astr. Journ., Vol. xvn., (No. 390) pp. 42 - 44, 1896. See also The 

 Observatory, Vol. xx., pp. 214-215, May 1897. 3 Loc. cit., p. 44. 



4 Untersuchung der Eigenbewegung von 523 siidlichen Sternen. — Astr, 

 Nach. Bd. cxliv., pp. 33 - 58, 1897. 



