parallax of certain fixed stars. 293 
The conclusion as to the parallax of this star does not differ 
materially from my former one, where the three microscopes 
were used. 
Summer Zenith dist. Jan. 1, 1817. 
N°. Ob. 
by bottom microscope. 
1808-1812 
1814 
1815-1816 
1817 
38 
21 
22 
2 5 
10 6 
44 59 S&38 + ,38 p 
36,92 + ,21 p 
36,10 + ,30 p 
3^,54 + > 26 P 
Winter Zenith dist. Jan. 1, 1817. 
N°. Ob 
by bottom microscope. 
1808-1812 
1813-1814 
1816- 1817 
1817- 1818 
38 
24 
20 
20 
44 59 38,51 ~ > 4 ° P 
39,20 — ,47 p 
38,36 — ,45 p 
37’57 — >44 P 
102 
The correct means give 
44 *° 59 ' 36 " >47 + , 3 ° P = 44 ° 59 ' 3 %"s 6 — >44 P 
i,8q ,, 
P=-~ = 2 ’53 
or 2 p = 5^,0 by 208 observations. 
