Inferences concerning Auroras.

shown in the seventh column of the table is little affected by differences in the limiting brightness. This divergence indicates that, as compared with both Kapteyn and Mount Wilson, their results are not homogeneous; and noting, further, that the numerous and careful guages of the Herschels which extend to the 14th magnitude give a galactic condensation agreeing closely with Kapteyn (Herschel 12.9, Kapteyn 11, Chapman and Melotte 3.9), one gains the impression that, through some unknown cause, their counts in the richer fields fail to include many of the fainter stars.