315 Autograph manuscript pages numbered 1-313 (some pages misnumbered, a few sub-pages i.e. 16a, 16b & 16c), mostly in purple ink and written on one side, followed by 6 unnumbered pages of manuscript diagrams of the Pacific Ocean and the distribution of fish at Darwin Bay, Cocas Island, etc., plus 6 unnumbered pages of notes relating to the book. Each page measures 8¼x5½.

Apparently, originally to be titled "In the Warmth of Tropic Seas," as is written on page 1 of the manuscript. Also he writes, "By Romer Zane Grey," but a pencil mark has deleted his middle name. Of the two Romer Grey titles, this is the more scarce according to Ed Myers. Written by Romer Grey, the son of famed fishing and Western author Zane Grey. The manuscript has corrections in pen and pencil, deletions and notations (many on verso of pages).