100 



COSMOS. 



progresses in order of the squares, 1, |th, ^th, Jgth . . . He likewise 

 treats of geometric progressions, as, for instance, 1, 1, Ith, |th, ... or 1, 

 ^d, Ith, -^yth The gradations employed by yourself in your ob- 

 servations under the equator, during your travels in America, are ar- 

 ranged in a kind of arithmetical progression (Recueil aVObserv. Astron., 

 vol. i., p. lxxi., and Schumacher's Astron. Nachr., No. 374). These 

 scales, however, correspond less closely than the photometric scale of 

 progression (by squax*es) with the vulgar scale. In the following table 

 the 190 stars have been given from the Outlines, without reference to 

 their declination, whether southern or northern, being arranged solely 

 in accordance with their magnitudes." 



List of 190 stars from the first to the third magnitude, arranged accord- 

 ing to the determinations of Sir John Herschcl, giving the ordinary 

 magnitudes with greater accuracy, and likewise the magnitudes in ac- 

 cordance with his proposed photometric classificatio?i : 



Stars of the First Magnitude. 



Sirius 



n Argus (Var.) 



Canopus 



o Centauri 



Arcturus _.. 



Rigel 



Capella 



a Lyrae 



Procyon 



Magnitude. 



Vulg. 



008 



0-29 



059 



077 



082 



10 



10 



10 



Phot. 



049 



0-70 



100 



1-18 



1-23 



1-4 



1-4 



1-4 



Orionis ... 

 Eridani... 

 Aldebaran 

 Centauri.. 

 Crucis ... 

 Antares .. 

 Aquilae ... 

 Spica 



Magnitude. 



Vulg. 



10 



109 



11 



117 



1-2 



1-2 



1-28 



1-38 



Phot. 



1-43 



1-50 



15 



1-58 



1-6 



1-6 



1-69 



1-79 



Stars of the Second Magnitude. 



Fomalhaut . 



8 Crucis 



Pollux 



Regulus ... 



a Gruis 



Crucis 



Orionis 



Canis 



Scorpii 



Cygni 



Castor 



e Ursae (Var.) 

 a Ursae (Var.) 



C Orionis 



8 Argus 



a Persei 



y Argus 



e Argus 



ti Ursae (Var.) 

 y Orionis 



Magnitude. 



Vulg. I Phot 



1 541-95 



1-9 

 2 

 20 

 2 07 



1-57 

 1-6 

 1-6 

 1-66 



1-73214 

 1-84225 

 1-862-27 

 1-87 2-28 

 1 90 2 31 

 1-94235 

 1-95236 

 1-96 2-37 

 201 2 42 

 203 2 44 

 207 2-48 

 2082-49 

 2-18|2-59 

 2182-59 

 2-18259 



a Triang austr. 

 e Sagittarii ... 

 8 Tauri 



Polaris 



6 Scorpii 



a Hydrae 



6 Canis 



a Pavonis 



y Leonis 



8 Gruis 



a Arietis 



Sagittarii . . . 



Argus 



Ursae 



Andromedae. 



Ceti 



Argus 



Aurigae 



Andromedae . 



