The book is available at Hathi Trust (I have not checked for other online sources).
Table of Contents
Hiawatha
Beowulf
Childe Horn
Sir Galahad
Rustem and Sohrab
The Seven Sleepers of Ephesus
Guy of Warwick
Chevy Chase
The Fate of the Children of Lir
The Beleaguered City
Prester John
The Wandering Jew
King Robert of Sicily
The Life of the Beato Torello da Poppi
The Lorelei
The Passing of Arthur
Rip Van Winkle
The Gray Champion
The Legend of Sleepy Hollow