vgo Dr. Herschei/s Observations to investigate 
indentations go down at the sides, like circular arches, present- 
ing their concavities to us ; but the bottom of them is nearly 
flat.* 
Indentations are without Openings. 
Jan. 15, 1801. The low places of corrugations do not contain 
punctures ; but seem to be irregularly shaped places, of less 
luminous matter than the borders which inclose them. 
In some Places the Indentations contain small Openings. 
Dec. 27, 1799. On examining some of the largest corruga- 
tions with a high magnifying power, I see plainly, that the less 
bright parts, or indentations, are small openings ; and that those 
dark places, which were the coarsest, shew the opaque surface 
of the sun best: some of them are as black as the large 
openings. 
The Elevations and Indentations of Corrugations are of different 
Figures. 
Feb. 18, 1800. Among all the corrugations, I could hardly 
perceive any that were round : they were of all shapes ; chiefly 
lengthened. 
Indentations change to Openings. 
Feb. 10, 1800. Three corrugations, observed an hour ago, 
are now so enlarged, that their indentations are passed over 
from their former state, to small openings. 
See Plate XIX. Fig. 19. 
