100 



COSMOS. 



progresses in order of the squares, 1, 1th, ith, y^^th . . . He likewise 

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

 Id, Ith, -^^^th The gradations employed by yourself in your ob- 

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

 ranged in a kind of ai'ilhmetical progression (Recueil d^Observ. Asfron., 

 vol. i., p. Ixxi., and Schumacher's Asiron. Nachr., No. 374). 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." 



hist 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 i?i ac- 

 cordance 7cith his proposed photometric classification : 



Stars of the First Magnitude. 



star. 



Magnitude. 



Vulff. Phot, 



008 



0-29 



Sirius 



71 Argus (Var.) 



Canopus 



a Centauri |0-59 



Arctnrus '0-77 



Rigel :082 



Capella llO 



a Lyra? ■ 1 



Procyon 10 



0-49 



0-70 



1 00 



M8 



1-23 



14 



1-4 



1-4 



star. 



Vulg. 



a Orionis 10 



a Eridani 109 



Aldebaran 11 



[3 Centauri M7 



a Crucis 1-2 



Antares 1-2 



a Aquilae 1-28 



Spica ;i-38 



Magnitude. 



Pilot. 



1-43 

 1 50 



5 



58 



6 



6 



69 



1-79 



Stars of the Second Magnitude. 



star. 



Fomalhaut 



Crucis 



Pollux .... 

 Regulus ... 



Gruis 



Crucis 



Orionis 



Canis 



?i. Scorpii 



a Cygni 



Castor 



c Ursae (Var.) 

 a Urs3e(Var.) 



C Orionis 



8 Argus 



a Persei 



y Argus 



£ Argus 



T] Ursae (Var.) 

 y Orionis 



Magnitude. 



Vulg. I Phot. 



1-54 1-95 

 1-57 1-98 

 1-6 j20 

 1-6 j20 

 1-66 2 07 

 1-73 2 14 

 1-84 2 25 

 1-86 2-S 

 1-87 2-28 

 1 90231 

 1-94235 

 1-95 2 36 

 1-96 2-37 

 201242 

 203 2 44 



207 2-48 



208 2-49 

 -18259 



182-59 



18|2-59 



star. 



a Triancr austr. 

 £ Sagittarii ... 



13 Tauri 



Polaris 



d Scorpii 



a Hydrae 



6 Canis 



a Pavonis 



y Leonis 



(3 Gruis 



a Arietis 



(7 Sagittarii . . . 



6 Argus 



C Ursae 



(3 Andromedae. 



i3 Ceti 



A Argus 



(3 

 7 



Auriga? . 



Andromeda? 



