100 



COSMOS. 



progresses in order of the squares, 1, Jth, ^th, J^th . . . He likewise 

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

 Id, Itb, JLth 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 d'Observ. Astron., 

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

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

 progression (by squares) 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 Herschel, giving the ordinary 

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

 cordance with his proposed photometric classification : 



Stars of the First Magnitude. 



Sirius 



7) Argus (Var.) 



Canopus 



a Centauri 



Arcturus ... 



Rigel ... 



Capella 



a Lyra 



Procyon 



Magnitude. 



Vulg. 



008 



0-29 

 0-59 

 0-77 



82 

 10 



1 

 10 



Phot. 



0-49 



0-70 



1 00 



118 



1 23 



1-4 



1-4 



1-4 



a Ononis... 

 a Eridani ... 



Aldebaran 

 (3 Centauri.. 

 a Crucis ... 



Antares .. 

 a Aquilae ... 



Spica 



Vulg. 



10 



109 



11 



117 



1-2 



1-2 



1-28 



1-38 



Pliot. 



1 43 

 1 50 

 15 

 1-58 

 1-6 

 16 

 1 69 

 1-79 



Stars of the Second Magnitude. 



Fomalhaut . . 

 /? Crucis 



Pollux 



Regulus 



a Gruis 



y Crucis 



e Orionis 



e Canis 



X Scorpii 



a Cygni 



Castor 



e Ursae(Var.) 

 a Ursae(Var.) 



f Orionis 



(3 Argus 



a Persei 



y Argus 



t Argils 



n Ursae (Var.) 

 y Orionis 



Magnitude. 



Vulg. I Phot. 



1 54 195 



1-98 

 2 

 20 

 2 07 



1-57 



1-6 



1-6 



1-66 



1-73J2 14 



1-84:2 25 



1 862 27 



l-87!2-28 



1 90 2 31 



l-94;235 



1-95 2 36 



1-962-37 



2-01 fe 42 



203 2 44 



2072-48 



208249 



218259 



2- 182 59 



2-18259 



Triang austr. 



Sagittarii 



Tauri 



Polaris 



Scorpii 



Hydra; 



Canis 



Pavonis 



Leonis 



Gruis 



Arietis 



Sagittarii ... 



Argus 



Ursae 



Andromeda;. 



Ceti 



Argus 



Auriga; 



Andromedae . 



Magnitude. 



Vulg. 



2 23 

 2-26 

 2-28 

 2 28 

 229 

 230 

 2 32 

 233 



Phot. 



2 64 

 2-67 

 2 69 

 2 69 

 2-70 

 271 

 2 73 

 2-74 



234275 

 236277 

 2-40281 

 241 282 

 2-42,2-83 

 243284 

 2-45 2-86 

 2-46287 

 2-4628* y 

 2-48 2-89 

 2-50>91 



