H. A. Guerber, Myths of northern lands (1895)
“ Heimdall, like Argus, was gifted with marvelous keenness of sight, which enabled him to perceive even the growth of the grass. His Giallar-horn, which could be heard throughout all the world, proclaiming the gods’ passage to and fro over the quivering bridge Bifröst, was like the trumpet of the goddess Renown. As he was related to the water deities on his mother’s side, he could, like Proteus, assume any form at will, and made good use of this power on one occasion to frustrate Loki’s attempt to steal the necklace Brisinga-men. ”
