Some obvious minor typographical and punctuation errors and misprints have been corrected silently.
Illustrations and tables have been moved out of text paragraphs.
Illustration numbers have been added to the lists of illustrations.
Page 4, "Entrance to Bouquette Valley": page number 350 changed to 353, and entry moved to appropriate place in list. Entries 588 and 589 have been replaced with the captions of the illustrations as present in the source document. The original entries were as follows: One Step Upward from a Palm-Thatched Hut, 405; Bird’s-Eye View of the Panama Canal , 405. The last six entries have also been replaced with the illustration captions as present in the source document. The original entries were as follows: The Brook at Taboga, 408; One of the Smaller Slides, 408; Giant Steam Mixers, 409; Machinery Wrecked by a Slide, 410; The Great Falls of Chorrera, 411; A Twentieth Century Liner Locking, 412.
Page 36: "Goethal’s" changed to "Goethals’".
Page 40: "MANGOES" changed to "MANGROVES" (also in List of Illustrations).
Page 42: "... bought for a song those who had ..." changed to "... bought for a song. Those who had ...".
Page 90: "Camboa" changed to "Gamboa".
Page 102: "Goethal’s" changed to "Goethals’".
Page 164: caption "BIG GUNS FOR CANAL DEFENCE" inserted.