Variation of Light in the Star Algol. 3 
tained, as the phenomenon was certainly within half an hour 
of the time fixed by Mr. Goopricxe, which, divided on eight 
periods, gives only an error of four minutes on the length of 
it; and a nearer coincidence is not to be expected in a matter 
of this nature, where eftimation 1s the only means of deter- 
mining the brightnefs, and two perfons can hardly agree within 
a few minutes, from the difference of fight. 
Tam, &c. 




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