458 Scientific Intelligence. 
opposite side.) The result of my researches may be expressed as 
follows : . 
1. The parallax of a” is equal to that of a’. 
2. The parallax of a is 1-17 greater than that of a’. 
3. The parallax of 1880 G. is 0-14 greater than the arithmetical 
mean of the parallaxes of a and a’; i. e., it is 0/72 greater than the 
parallax of a’ or of a’. 
Thus the mysterious discordance which before existed between the 
parallax obtained by you in 1846, and that given by the Konigsberg 
heliometer is explained by the interesting fact that the star of compar- 
ison a is nearer to us than 1830 G. You know that my reduction of 
the observations made by M. Schlueter gave for the parallax of 1830 G. 
0-18, on the supposition that the stars of comparison had no paral- 
lax, a result obtained by the discussion of differences of distance. But 
tion is presented, in the same direction, and of the same amount. To 
explain this | have formed two hypotheses; one, that this variation In 
presents the observations very well, without leaving periodic errors 0 
Of 1830G. Of the star @ 
By Schlueter’s observations, —0'"75 — "15 
ied 2 =0"-68 =1"19 
: Or if we deny the difference of parallax of the stars of comparison, 
it will necessarily result from the observations made with the heliome- 
tions are arranged in such a manner, as you will see in my memoir, 
that the differences of distance and the consequent result are wholly 
free from the influence of the periodic change which is manifested in the 
sum of the distances, whatever may be the cause of it. The jnevita- 
ble alternative is, that the parallax of 1830 G. is less than 0-2, a value 
Not at all probable, or that the star a is nearer to us than 1830 & | 
have no doubt that the last, which is indicated by the observations, 1S 
the truth ; and I believe this interesting result is established so surely 
by the heliometric measures, that it will be very difficult to pre 
ie ‘8° parallax of this star of comparison which I have found 
ot exist.” 
ee i ee 
* Astronomische Nachrichten, Nos, 840-844. r 
