Yggdrasil.

Chambers's Encyclopaedia, Volume 10: Swastika to Zyrianovsk and Index, p. 779

Yggdrasil. See SCANDINAVIAN MYTHOLOGY. According to Vigfusson and Powell (Corpus Poeticum Boreale, 1883), Yggdrasil is not a primitive Scandinavian idea, but originating after the contact with Christianity, and so a corruption of the cross.

Source scan(s): p. 0808