Punctuation, hyphenation, and spelling were made consistent when a predominant preference was found in this book; otherwise they were not changed.

Simple typographical errors were corrected; occasional unbalanced quotation marks retained.

Ambiguous hyphens at the ends of lines were retained.

Page 162: “ominum gatherum” likely is a misprint for “omnium gatherum”.

Page 167: “resistent” was printed that way twice in this article. In a different article, it was twice printed “resistant”.

Page 207: Unmatched closing quotation mark deleted after “from other men.”

Page 211: “corrolary” was printed that way.

Page 214: “calcium carbid” was printed that way.

Page 220: The first occurrence of “American Museum of Natural History” was printed without the “of”; the second with it.