University of Edinburgh, Mathematical Department, 1914. First Edition. 8vo, paged -686, 1 leaf of plates, illustrated; G+; blue cover with black print, peripheral tanning, smudging and spotting; interior clean but for slight spotting; "University of Edinburgh, Mathematical Department, Session 1914, Research Paper No. 4"; "Reprinted from the Monthly Notices of the Royal Astronomical Society, Vol. LXXIV. No. 8."
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