PHOTOMETRIC SCALE. 137 



" The following short table of the photometric quantities of 

 17 stars of the 1st magnitude (as obtained from the photome- 

 tric scale of magnitudes) may not be devoid of interest:" 



Sirius 4-165 



17 Argus 



Canopus 2-041 



a Centauri . . . . ' . . I'OOO 



Arcturus 0-718 



Rigel 0-661 



Capella 0-510 



aLyrae . .... 0-510 



Procyon ...... 0*510 



a Orionis 0'489 



aEridani 0-444 



Aldebaran 0-444 



/3 Centauri 0-401 



aCrucis 0-391 



Antares 0*391 



a Aquilae ...... 0-350 



Spica 0-312 



" The following is the photometric quantity of stars strictly 



belonging to the 1, 2 6 magnitudes in which tht 



quantity of the light of a, Centauri is regarded as the unit :" 



itagnitude on the vulgar scale. Quantity of Light. 



1-00 0500 



2-00 0-172 



3-00 0-086 



4-00 0-051 



5-00 0-034 



C-00 0-024 



