The Uranometria Argentina. 879 
Chapter VIII, which is a dissertation on the distribution of 
the stars (occupying 85 pages), opens with a table showing “ the 
number of stars, of each grade of brilliancy from 7™-0 upward, 
which are to be found south of the parallel of ten degrees north 
declination.” The results of this table are:— 
Magnitude. No. Stars South Declination. No. Stars North Declination. 
0°0 to 2°0 19 3 
2'1 to 3-0 66 6 
3°] to 4°0 166 29 
41 to 5-0 321 
5'1 to 6-0 1238 174 
61 to 7-0 4884 124 
_ Putting 2, to represent the total number of stars contained 
in the catalogue to the mth magnitude inclusive, he finds 
>,,==0°54896 (3°9111)™ 
to be a near approximation to the number of stars of each mag- 
nitude contained within the limits. Then follows a careful and 
somewhat elaborate comparison between the numbers of stars 
assigned to the several magnitudes in the Durchmusterung, the 
Uranometria Nova and the Atlas Coelestis of Heis. . G 
sums up the result of his extremely interesting investigation 
(p. 368) as follows: 
_ “1. There is in the sky a girdle of bright stars, the medial 
line of which differs but little from a circle, inclined to the 
galactic circle by a little less than 20°. 
2. The grouping of the fixed stars brighter than 4-1 is more 
systematic, relatively to that medial line, than to the galactic 
circle; and the abundance of bright stars in any region of the 
sky is greater as its distance therefrom is less. 
v 
the preceding paragraph, and supposing the several magni- 
_ tudes of the stars in the cesta to follow the law of Probabili- 
Hes, we obtain for each class of magnitudes a number, which 
