21 9 
ever the Disk of the Sun , &c. 
a frost is coming on; though Datchet Common, which is just 
before my garden, is all under water; and the grass on which 
I stand with my telescope is as wet as possible. 
(t>.) Feb. 2 6, 1783. All the ground is covered with snow: 
yet I see remarkably well. 
(7.) March 8, 1783. The common before my garden is all 
under water; my telescope is running with condensed vapour; 
not a breath of air stirring. I never saw better. 
(8.) August 25, 1783. My telescope ran with water all the 
night. The small speculum, which sometimes gathers moisture, 
was never affected in the 7-feet tube, but was a little so in the 
20-feet. The large eye-glasses and object-glasses of the finders, 
required wiping very often. I saw all night remarkably well. 
Fogs. 
(9 ) Oct. 30, 1779. It grows very foggy, and the moon is 
surrounded with strong nebulosity ; nevertheless, the stars are 
very distinct, and the telescope will bear a considerable power. 
(10.) August 20, 1781. It is so foggy that I cannot see an 
o'bject at the distance of 40 feet; yet the stars are very distinct 
in the telescope. By an increase of the fog, a, Piscium can no 
longer be seen by the eye ; yet, in the telescope, it being double, 
I see both the stars with perfect distinctness. 
(11.) Sept. 6 , 1781. A fog is come on; yetfl see very well. 
(12.) Sept. 9, 1781. There is so strong a fog, that hardly a 
star less than 30° high is to be seen ; and yet, in the telescope, 
at great elevations, I see extremely well. 
( 13.) March 9, 1783. It is very foggy; yet in the telescope 
I see the stars without aberration, and they are very bright, 
a Serpentarii is without a single ray. 
F f 2 
