Underscores “_” before and after a word or phrase indicate _italics_ in the original text. Equal signs “=” before and after a word or phrase indicate =bold= in the original text. Small capitals have been converted to SOLID capitals. Illustrations have been moved so they do not break up paragraphs. Footnotes have been moved to the end of the chapter in which they occur. Typographical errors have been silently corrected. BY GEORGE FRANCIS ATKINSON, PH.B. _Professor of Botany in Cornell University_…
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