Texts _between underscores_ and =between equal signs= represents text printed in italics and bold face in the source document. Superscript characters have been transcribed as ^{x}. Small capitals have been transcribed as ALL CAPITALS. The Papers here collected and reprinted, with some alterations, were not originally written as a series; but they do, in fact, form one, inasmuch as the opinions put forward in each Paper were arrived at, one after the other, simply by following one leading clue.…
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