parallax of certain fixed stars. 2 95 
Winter Zenith dist. Jan. 1, 1811. 
N°. Ob. 
alls 
1808-1813 
1814- 1815 
1815- 1816 
1816- 1817 
1817- 1818 
61 
20 
14 
15 
24 
14 46 20,96 — ,79 p 
21,00 ,78 p 
19,47 — ,68 p 
20,88 — ,76 p 
20,06 — ,76 p 
134 
The correct means give 
1 9"> 6 3 + ,76 P = 20", 64 — ,77 p 
or p = o ", 66 
or 2 p = 1", 32, the result of 262 observations of 
« Lyras. 
7 Draconis. 
Of this star, the mean of 53 observations in , n 
winter gives mean Z. D> Jan. 1 1814. = 1 52 17,55 
59 observations in summer give = 1 52 17 ,92 
This result is in a direction contrary to parallax, and there- 
fore had I compared the differences of zenith distances of this 
star and aLyrae, in summer and winter, the result would have 
given me a greater parallax for « Lyras. 
This conclusion is quite opposite to that of Mr. Pond, and 
seems to me a point of much difficulty to be explained. 
However, from the mean of my late results as to a. Lyras, I 
am inclined now, to consider my former argument deduced 
from 7 Draconis of less weight than I had attributed to it, not 
thinking the observations of 7 Draconis sufficiently numerous. 
