358 Dr. Herschel’s additional Observations 
At equal distances from the limb, the corrugations are equally 
coarse all over the disk of the sun. 
March 22. An additional opening, with surrounding ridges, 
has lately entered the north-following limb. I counted 21 
openings. 
March 31. An opening very near the preceding limb is sur- 
rounded by a shallow, which is bordered by a luminous ridge 
all round it. The opening itself is also bordered by an elevated 
edge, which is nearly as high as the general surface of the cor- 
rugations ; but not so high as that which borders the shallow, 
and stands above the general surface. 
April 1, 1 i h 30'. I saw the opening of yesterday go out of the 
limb : it was the only one left. 
2 h o'. The sun is now without any openings ; but the corru- 
gations are very luminous and rich. 
April 2. A considerable opening has entered the disk, accom- 
panied with ridges. From its present situation, I conclude it 
must have entered not long after my last observation yesterday. 
The sun is very rich in luminous corrugations, interspersed 
with bright nodules towards the south pole. 
April 4. There are 4 considerable openings, and many ridges, 
as well as nodules, on the south and north preceding and follow- 
ing limbs. 
The north-preceding ridges extend into the sun, till I can no 
longer distinguish them ; and begin again at the north-following 
side, as far as they generally can be seen from the limb ; so that 
there is probably a whole zone across the disk. Where I lose 
them, they are generally converted into tufted, rich, coarse cor- 
rugations, such as the sun is now every where covered with. 
April 6. There are many ridges and rich corrugations ; but I 
