C 252 ] 
Remark. 
An account of the like appearance is given by Dr. 
Langrifh in the Philofophical Tranfatiions , N° 369. 
The defcription of it agrees with this of Mr. Webb. 
The dodlor obferves, that its figure may be an hyper- 
bola, parabola, or ellipfis, according to the angle of 
the interfedtion of the plane of the horizon with the 
cone of rays. That, which he faw, he took to be an 
hyperbola. 
fingulis foliis inhaerefcere videret, quas e denfiore nebula, quae 
aerem paulo ante obfcuraffet, formatas exiftimabat, mirari debit ; 
cum enim explicationem fupra traditam non ignoraret, judicabat 
continuo iftas aquae guttas arcus cceleftis fpeciem exhibere, qui ap- 
paruit, quoad guttae herbarum foliis inhaererent. Probe etiam in- 
telligebat, eum arcurn videri debere imerfum, ut profecto videba- 
tur, quod iftae aquae guttae inferiorem tantum fuperficiei coni 
axem afpectus ambientis partem occuparent. 
XXXVII. 
