Underscores “_” before and after a word or phrase indicate _italics_ in the original text. A single underscore after a symbol indicates a subscript. Carat symbol “^” designates a superscript. Small capitals have been converted to SOLID capitals. Illustrations have been moved so they do not break up paragraphs. Typographical errors have been silently corrected. The numerical references to the NOTES, e. g. [1] have been changed to “(see NOTE x)” in order to avoid confusion with the true footnotes. [Illustration: SATURN—PHOTOGRAPHED AT THE LOWELL OBSERVATORY BY MR. E. C. SLIPHER. SEPTEMBER, 1909.]…
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