16 ON THE NATURE OF THE SUN. 



large opening obferved January 25, 1801, at 9 h 22 m . The 

 Narrative. note is as follows : " A large opening, which I have been ob- 



serving fince the 19th, is now much advanced towards the 

 limb. I can tee into it ; and on the preceding fide, as it ap- 

 pears to me, a good way under the lowed regions of the 

 clouds of which the ihallow confifts. The upper margin of 

 the ihallow is very fharply determined ; but the clouds at the 

 lower part ©f it, on the contrary, are more difperfed ; fomG 

 of them hanging a good way down towards the (urface of the 

 fun's body. See Fig. 11. At 10 h 20 m the preceding fide of 

 the ihallow of the large opening is now more abruptly ter- 

 minated at the bottom of its thicknefs; the hanging or pro- 

 jecting clouds being removed towards the following fide. 

 See Fig. 12." 



Of Shallows. 

 Shallows, or Shallows are deprefled below the general furface of the fun, 



bdow thTiumi- anc * are P^ aces where the luminous folar clouds of the upper 

 nous clouds. regions are removed. Their thicknefs is vifible. They 

 fometimes exift without openings in them. They begin from 

 the openings or branch out from fhallows already formed, 

 and go forwards. The probable caufe of fhallows is deduced 

 from the obfervations, among which the following are de- 

 lineated. 

 OMervations of January 25, 1801, 9 h 20 m . Two branches, A B, Fig. 13, 

 the ihallows j Q f a fl la i| ow com ing from an opening C, going towards the 

 fouth. It feems as if they were deftined to meet the in- 

 cipient Ihallow of a fouth-following opening D. 9 h 50 m the 

 (hallow B is very nearly united to the narrow part of the 

 ihallow furrounding the opening D. The ihallow H feems 

 / to advance in a direction towards the fartheft fouth-following 



opening E. 10 h 20 m the (hallow B is completely run into the 

 dial low about D ; and the (hallow A is grown broader to- 

 wards F. ll h 30 m the (hallow B is fo completely joined to 

 the (hallow D, tbat it appears as if it had not come from die 

 opening C. The (hallow A now ends in a (harp point, Fig. 

 15. 12 h 50 m the (liape of the (hallow A is no longer pointed, 

 but very broad at the end, and there is a new branch breaking 

 they are caufca out at G, Fig. 16.- Thcfe changes feem all to denote that 

 by the propelling t j ie fhallovvs are occafioned by fomething coming out of the, 



gas which pro-. . •••■''. n« • i • , L 



duces the open- openings which, by its propelling motion, dnves, away the 

 ings. luminous 



