[217] Loc. cit.
[218] Jesse, Gleanings, iii., p. 176.
[219] Introduction to Arctic Zoology, p 70.
[220] Dr. Henderson, Journal of a Residence in Iceland in 1814 and 1815, vol. ii., p. 187.
[221] The American Beaver and his Works (Lippincott & Co. 1868).
[222] To obviate this possibility, they often select as their site a place where a spring happens to rise in the bottom of the lake or pond.
[223] In times of considerable 'freshet' the former case sometimes occurs; the beavers not being able to provide for a very considerable overflow through their dams, the latter become then wholly submerged. When again exposed, the animals take great pains in repairing the injuries sustained.
[224] Note on Beaver Dams (Proc. Boston Soc. Nat. Hist., 1869, p. 101, et seq.).
[225] Plin., Hist. Nat., viii. 1-13.
[226] De Solert. Anim., c. 12.