35^ Dr. Herschel’s additional Observations 
must be left to future investigation : it should, however, be care- 
fully attended to. 
OBSERVATIONS OF THE SUN. 
March 4, 1801. I viewed the sun with a skeleton eye-piece, 
into the vacancy of which may be placed a moveable trough, 
shut up at the ends with well-polished plain glasses, so that the 
sun’s rays may be made to pass through any liquid contained 
in the trough, before they come to the eye-glass. * 
Through spirit of wine, I saw the sun very distinctly. There 
are 10 openings without shallows ; and a pretty considerable 
one with a shallow. The opening is nearly round; and the 
shallow is concentric with it, and also round. The want of shal- 
lows about the small openings, and the roundness of that about 
the largest, indicate that the elastic empyreal gas which passes 
through them, is without side-bias in its motion. -f 
March 8. I viewed the sun through water. It keeps the heat 
off so well, that we may look for any length of time, without 
the least inconvenience. There are a few openings, many ridges 
and nodules. 
March 9. The ridges near the preceding limb are more ex- 
tensive than I have ever seen them ; there is a broad zone of 
them. 
March 12. There is a cluster of 20 small openings ; none of 
them have any shallows. 
March 13. There are 31 openings in the cluster of yesterday : 
* See Plate XXVIII. Fig. i and 2. 
f See page 281 of my last Paper, “ Probable Cause of Shallows'” and page 301, 
“ The solar Atmosphere, like ours,” &c. 
