62
Sidereal Explorations
gree in each spectral class, down to visual
magnitude 8.75, in the Henry Draper
Catalogue.
stars between magnitudes 10.1 and 11.0 in
the Cygnus region.
Taurus, Figure 3. Further analysis of the material of the
Henry Draper Catalogue shows the well known phenom-
enon of high concentration to the Milky Way for stars of