Prof. Cleavdand's descrijjtion of Halo s and FavheJIa. 



1S8 



Th 



DH and DG s«cmed 



tend toward 



if so^ their centres, ia the projection, would 

 drawn from the true sun through the parhe] 



pari 



In the arc MP, the point P was a few degrees above the 



rizon. 



Concerning the planes of the hal 



tainty 



The plane ofDFSE 



evidently parallel to the hori- 



aud formed, at its lower side, an obi 



of the halo BOIN ; 

 Tvith thatof BOIN 



o 



1 



of ABC 



the pl.Tne 



d 



A Siiiall cloud passed between S and B^ and became very Lri 



and irised. 



In the pbenom< 

 of halos, and 5 p; 

 marks are correct^ 

 I have already as( 



O 



ht 



d 



were 9 halos or arcs 



mocksuns ; and, if the preceding re- 



7 



centres for th 



rtained, that these, or rather similar h 



&c. were observed, more or less distinctly, for an extent of at least 

 45 miles in the direction of the meridian. This is probably a very 

 uncommon circumstance.* 



The preceding figure agi 

 phenomena observed by Sche 



lius. at Sedan, in ififil : hv 



part with fi 

 Rome, in 



the Philo 



gures of sin 



16^9 ; by B 



ty, at Paris 



1667 



Mr 



Ens. in 1699 &c. B 



more compl 

 lialos. 



of them, and 



some additional 



* Since this paper was written, I have been informed, that similar appearan- 

 ces were observed at Boston, on the morning of the same daj. 



■T% 



% 



-L 



