2 C) 4 t Dr. HersChel's Observations to investigate 
There are two different Regions of Solar Clouds. 
Feb. ig, 1800. It is not possible to see the sun more distinctly 
than I do at present. The corrugations are evidently caused by 
a double stratum of clouds ; the lower whereof, or that which 
is next to the sun, consists of clouds less bright than those 
which compose the upper stratum. The lower clouds are also 
more closely connected ; while the upper ones are chiefly de- 
tached from each other, and permit us to see every where 
through them. 
Feb. 5, 1801. An opening near the preceding limb has no 
shallow about it. I can see the thickness of the preceding par- 
tition, from the top of the luminous clouds down to the vacancy; 
and perceive that the .lower part of the descent is of a less bright 
nature than the upper one : it is of the colour of an incipient 
shallow. 
The inferior Clouds are opaque, and probably not unlike those of 
our Planet. 
Feb. 5, 1801. The shallows about three considerable openings, 
on the following side of the sun, are of the same colour with 
that of a large opening on the preceding side. 
Feb. 18, 1801. The tufts of the shallows, or lower clouds, 
are all of the same colour. 
The shallows about the three largest openings are all of 
the same colour, which is that of all the shallows I have ever 
seen. 
Feb. 4, 1801. The colour of a very small shallow about a 
little opening, is as faint as that of a large shallow of a very 
large opening now in view; and, as far as I can remember, all 
the shallows I have seen have been nearly of the same colour. 
