FeralChildren.com says The title story is another Tarzan-like feral boy story.

Product Description 1898. Robertson draws upon his own rich and wild experience as a seaman on the Atlantic to write a collection of sea tales including: The Hairy Devil (sea horror), Slumber of the Soul (submerged personality), Survival of the Fittest (miraculous seamanship). The title story of a feral boy and feral girl could well have inspired Burroughs's book about Tarzan. See other titles by this author available from Kessinger Publishing.