the Nature of the Sun. 
287 
OF CORRUGATIONS. 
Corrugations consist of Elevations and Depressions. 
Dec. 23, 1799. The corrugations have a mottled appearance. 
I see the figure of the dark and bright places. Many of the 
dark places are not round, but a little extended in different 
directions, and appear to be lower than the bright places. This, 
if admitted, will explain why the corrugations towards the 
margin of the sun, cannot so readily be seen as about the middle 
of the disk. 
Jan. 4, 1800. ,The day being very favourable, I saw the sun 
uncommonly well. The corrugated surface presented its eleva- 
tions and depressions, with as much distinctness as the rough 
surface of the moon. 
Corrugations extend all over the Surface of the Sun. 
Dec. 23, 1799. The corrugations extend all over the sun. 
They are less distinct all around towards the limb, than at 
the centre. 
Jan. 22, 1800. I followed the corrugations from the centre 
to the circumference; and could trace them every where to 
within, I suppose, two minutes of the margin. 
Jan. 24, 1800. The corrugations are equally spread over the 
whole surface of the sun. I viewed them distinctly in every 
part of it; and traced them with much attention to within, I 
suppose, half a minute of the margin. 
Jan. 4, 1801. The corrugations are extended all over the 
disk of the sun, and go to the polar regions, as well as to the 
equatorial parts. 
