The plain text version of this ebook includes mathematical formulae in TeX notation. These formulae are enclosed between dollar signs. The HTML version includes the same formulae rendered in their original form. This contribution gives the results of a statistical investigation of 400 extra-galactic nebulae for which Holetschek has determined total visual magnitudes. The list is complete for the brighter nebulae in the northern sky and is representative to 12.5 mag. or fainter.…
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