222 
with the pendulums with wooden rods, about an inc*h was 
required to be added, and in this case 89-lOOths of an inch 
seems to have had the desired effect. 
The following is a copy of the rate of a clock at Mr. 
Worthington’s Observatory, fitted up with the pendulum 
above described. 
Date 
Sidereal time 
Arc of 
vibration 
Clock error 
Daily 
rate 
Temperature 
in the interval 
highest 
lowest 
1860. 
Jan. 11 
14 
h m 8 
2 12 54-8 
2 25 59*8 
o / 
2 27 
2 32 
s 
5 ’8 slow 
ll’O „ 
-1-1 *73 
39’7 
29-5 
20 
2 38 6-4 
2 32 
22-5 „ 
1-91 
47-0 
28-0 
29 
3 5 2-2 
2 32 
37-2 „ 
1-63 
42-0 
19-2 
31 
2 22 59-8 
2 32 
40-6 „ 
1-72 
39-0 
28*5 
A small weight was then placed on the top of the bob, to 
change the rate, and the following results were observed : — 
February 6, 6'^ ‘20™ 42®’ 1, to February 16, 6^ 1 1™ 5®’0, with 
mean temperature of 29°’ 1, the daily rate = — • 0®*67. 
February 16, 6^ 11™ 5®’0, to February 28, 6’* 45™ 21®’6, 
with mean temperature of 35°’ 1, the daily rate = — 0®*65. 
Extremes of temperature during the whole period — 
maximum = 44°*5 ; minimum = 16°’5. 
Mr. Baxendell, F. R.A.S., read a Paper entitled 
“ Observations of the Zodiacal Light.” 
The Zodiacal Light has lately been conspicuously visible 
on clear evenings, extending to an unusual angular distance 
from the Sun. On February 9, at 8^ Greenwich mean time, 
it was observed to extend to a point about two degrees north 
of the star s Arietis, and the intensity of its light in the 
brightest part was estimated to be about one-third of that of 
the Milky Way in Cepheus and Lacerta. February 12, at 
7'* 45™, the apex of the cone of light was about a degree north 
