pericdical Variation in Algol. 479 
At 9 1 h. between the fecond and third magnitude; a little 
lefs bright than a Caffiopeae. 
At 10 h. I believe it now at its ufual brightnefs. 
March 18, at 9! h. Mr. e. pigott thought it lefs bright; 
but the weather was very hazy. 
March 21 . 
At 7 1 h. it was about between the third and fourth magni- 
tude ; not fo bright as $ Perfei, but brighter than £ Perfei. 
At 8 h. rather a little brighter than £ Perfei, and fometimes 
equal to it* 
At 8i h. about the fourth magnitude; equal to £ Perfei; 
but fometimes it appeared rather a very little brighter. 
At 9 h. rather a little brighter than £ Perfei* 
At 10 h. about the third magnitude; equal to f and £ Perfei, 
but rather a little brighter. 
At io| h. brighter than £* and e Perfei. 
At 1 1 h. much brighter than £ and e Perfei ; rather between 
the fecond and third magnitude. 
April 10. 
At 8 h. it was about the third magnitude, and rather brighter 
than £ Perfei. 
At 8§ h. nearly equal to s Perfei, though rather a little 
brighter. 
At 9 h. rather lefs bright than e Perfei, but brighter than 
$ Perfei. 
At 9 1 h. rather lefs* bright than S Perfei, and between the 
third and fourth magnitude. 
At 9I h. about the fourth magnitude ; not fo bright as S Per- 
lei, but brighter than £ Perfei. 
At 10 h. rather lefs than at 9 1 h. ; believe it now very near 
its lead: brightnels* 
Vot. LXXIIL R r r April 
