ASTRONOMY: F. H. SEARES 
561 
The next step involved the segregation of the data for equidistant 
values of galactic latitude. The 0° ordinate for each of the original 
curves was plotted against the limiting magnitude just found for the 
curve to which it belongs. These points define a new curve expressing 
the variation of stellar density with magnitude for regions in 0° latitude. 
Similar curves were also derived for 10°, 20°, etc., by plotting the appro- 
priate ordinates of the original curves against their limiting magnitudes 
TABLE 1 
Comparison of Durchmusterung Results with Kapteyn and Mount Wilson 
MEAN 
LATITtTDE 
OBSERVED 
LOG 
GALACTIC 
LATrrUDE 
DM 
LOG 
Kapteyn 
MW 
KAPTEYN 
MINUS 
DM 
MW 
MINUS 
DM 
3.99 
5° 
3.97 
4.04 
4.03 
+0.07 
+0.05 
10 
3.90 
15 
3.79 
3.74 
3.76 
-0.05 
-0.03 
16 
3.75 
25 
3.50 
3.47 
3.43 
-0.03 
-0.07 
23 
3.63 
35 
3.22 
3.23 
3.16 
+0.01 
-0.06 
30 
3.32 
45 
3.00 
3.04 
3.00 
+0.04 
0.00 
37 
3.17 
55 
2.84 
2.89 
2.88 
+0.05 
+0.04 
47 
2.98 
65 
2.74 
2.74 
2.79 
0.00 
+0.05 
60 
2.79 
80 
(2.65) 
2.60 
2.69 
(-0.05) 
(+0.04) 
TABLE 2 
Differences in log from Astrographic Zones and from Kapteyn's Table 
OF Distribution 
(Unit = 0.01) 
MAGNITUDE 
GALACTIC LATITUDE 
0° 
10° 
20° 
30° 
40° 
50° 
60° 
70° 
80° 
8.5 
-3 
0 
0 
+2 
+2 
+ 1 
+ 1 
+ 1 
0 
9.0 
-3 
0 
0 
+ 1 
0 
-2 
-2 
-1 
-2 
9.5 
-1 
+ 1 
+3 
+2 
0 
-3 
-3 
-3 
10.0 
0 
+ 1 
+3 
+3 
0 
-2 
-3 
-2 
10.5 
-1 
+ 1 
+4 
+3 
0 
-2 
-4 
-2 
+ 1 
11.0 
-3 
0 
+4 
+3 
-1 
-2 
-3 
-2 
11.5 
-3 
-1 
+4 
+4 
+1 
-1 
-1 
0 
12.0 
-4 
-1 
+3 
+4 
+1 
0 
0 
+ 1 
-2 
12.5 
-5 
-1 
+4 
+5 
+3 
+2 
+2 
+ 1 
-1 
as before. From the new curves were read the densities corresponding 
to each half -magnitude interval from 8.5 to 12.5. The results, when 
tabulated, constitute a distribution table analogous to that of Kapteyn, 
though restricted in its range of brightness. 
Our interest is naturally in the agreement of these two tables. Their 
differences (Astrographic zones minus Kapteyn), in units of the second 
decimal, are shown in table 2. Though more or less systematic, the 
