221 
over the Disk of the Sun, &c. 
of the tube, but more than once have I found my feet fastened 
to the ground, when I have looked long at the same star. 
(21.) Oct. 4, 1782. It froze very severely this night. At 
first, when the frost came on, I saw very badly, every object 
being tremulous ; but, after some time, and at proper altitudes, I 
saw as well as ever. Between 5 and 6 o'clock in the morning, 
objects began to be tremulous again ; occasioned, I suppose, by 
the coming on of a thaw. 
(22.) Jan. 1, 1783. I made a number of delicate observations 
this night, notwithstanding, at 4 o'clock in the morning, my 
ink was frozen in the room ; and, about 5 o'clock, a 20-feet 
speculum, in the tube, went off with a crack, and broke into 
two pieces. On looking at Fahrenheit's thermometer, I found 
it to stand at 1 1°. 
(23.) May 6 , 1783. It freezes, and in the telescope the stars 
seem to dance extremely. 
Hoar-frost. 
(24.) Nov. 6, 1782. There is a thick hoar-frost; yet I see 
extremely well. It seems to enlarge the diameters of the stars ; 
but, as I see the minutest double stars well, trie apparent en- 
largement of the diameters must be a deception. 
(25.) Dec. 22, 1782. There is a strong hoar-frost gathering 
upon the tubes of my telescopes ; but I see very well. 
Dry Air . 
(26.) Dec. 21, 1782. The tube of my telescope is dry, and I 
do not see well. 
(27.) April 30, 1783. The stars are extremely tremulous 
