The apparition of two or more suns in the polar firmament is well known. Mr. Ellis saw six—they are most brilliant at daybreak—and though diminished in splendour, are still visible even after the appearance of the real sun.

[2.—Page 369, stanza xxvi.]

And tread where erst the Sire of freemen trod.

Thor's visit to the realms of Hela and Lok forms a prominent incident in the romance of Scandinavian mythology.

[3.—Page 370, stanza xxxvii.]

Enormous couch'd fang'd Iguanodon.

Dr. Mantell, in his "Wonders of Geology," computes the length of the Iguanodon (formerly an inhabitant of the Wealds of Sussex) at one hundred feet.

[4.—Page 371, stanza xxxix.]

Herds, that through all the thunders of the surge.

The Deinotherium—supposed to have been a colossal species of hippopotamus.