88 
By substituting the final mean value of An (Srruve-Perers) = — 0".24 
for the preliminary value —0".16 in the equation 
b cos d= Ansind + 0.93 X 
a second approximation for X is obtained from the R.A. only. In 
this way I find as the mean value from the four catalogues 
Groups b Groups F 
X= -+0".58 + 0".48. 
The result for An from the Decl. only does not change perceptibly, 
if we substitute for A these final values in place of the approx- 
imate ones. 
Finally L accept the means of both determinations of An and X 
as my final result. 
8. Conclusions. 
In the foregoing the following final values are found for the 
unknowns : 
Groups B Groups F B and F 
Lm (Newcoms) + 019 + 0"01 + 0"10 
An (NewcoMB) + 0.32 + 0.26 + 0.29 
xX + 0.59 + 0.52 
Y from the R.A. — 2.38 — 1.54 
Y from the Decl. — 3.01 — 2.36 
Mean (weights 2 and 1) — 2.59 — 1.81 
ZL + 1.92 + 2.59 
Let us first consider the value of 4m, + O"10 + 013, and of 
An, + 0"29 + 0'18. From both it is possible to deduce a cor- 
rection of the luni-solar precession accepted by Newco; I find: 
Am 
© strom. Am: SA Oe ORI 
COS € 
Ln el 
from An: Ap —— = + 0°72 £ 0 45. 
These values clearly show a difference, in the same direction as 
remains in the results found by Newcoms, even after correction for 
the systematic differences of distance. We now find: 
Ap (Decl.) — Ap (R.A.) = + 0"61 + 047. 
However, it is not very surprising to find such a difference 
occurring here. It is only 1.3 times as large as its mean error and 
