100 COSMOS. 



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

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

 ^d, th, ^th. .... 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. Atlron., 

 vol. i., p. Ixxi., and Schumacher's Astron. 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." 



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. 



STARS OF THE SECOND MAGNITUDE. 



