NOTES. 

 STAES OF THE THIKD MAGNITUDE continued. 



xlv 



" The following statement of the Quantities of Light in 17 Stars 

 of the First Magnitude (as they follow from the photometric mag- 

 nitudes) may possess some interest : 



Sirius . . . . 4.165 

 t) Argus .... 



Canopus .... 2.041 



a Centauri .... 1.000 



Arcturus .... 0.718 



Eigel 0.661 



Gapella .... 0.510 



oLyrse 0.510 



Procyon .... 0.510 

 as may also the Quantities of Light in Stars which are exactly of the 

 First to the Sixth Magnitudes : 



Quantity of light. 

 1.00 0.500 



2.00 0.172 



3.00 0.086 



4.00 0.051 



5.00 0.034 



6.00 0.024 



the quantity of light in a Centauri being the unit throughout.' 



Magnitude according to 

 the vulgar scale. 



