on the Nature of the Su?i. 359 
can perceive no opening. The air is not clear enough to discover 
very small ones. 
April 8. A cluster of 7 small openings is visible ; and many 
ridges. 
April 10. Five sets contain 32 openings. The sun is full of 
rich tufted corrugations. 
April 17. Two sets of openings contain 20 of them. 
April 19. I count 45 openings. The corrugations are ex- 
tremely rich. The whole solar surface seems to be studded with 
nodules. There are probably two belts of ridges across the sun’s 
disk ; for, on the preceding side, as well as on the following, 
I see two ends of belts of ridges very plainly, extending over all 
the space where these phenomena can be seen. 
April 20. The whole surface of the sun is rich : the corruga- 
tions are tufted. I count more than 50 openings; many of them 
have considerable shallows about them. 
April 23, 6 h . There are above 60 openings in the sun. The 
last set is much towards the sun’s north pole; very rich in ridges, 
and disturbed neighbouring surface. 
April 24. I count above 50 openings. The corrugations seem 
to be closer than they were yesterday. 
April 26. I viewed the sun through Port wine, and without 
smoke on the darkening glasses; but distinctness was much 
injured. 
April 27. I count 39 openings. Many ridges and rich cor- 
rugations. 
April 29. Six different sets contain 24 openings. There are 
many sets of ridges and rich corrugations. 
4 h . I viewed the sun through a mixture of ink diluted with 
water, and filtred through paper. It gave an image of the sun 
