at.,' May 11th, 1863, p. 7.

[37] 'Annals and Mag. of Nat. Hist.,' vol. xv., 1845, p. 140.

[38] Azara, 'Voyages dans l'Amer. Merid.,' tom. i. p. 381; his account is
fully confirmed by Rengger. Quatrefages gives an account of a bitch brought
from Jerusalem to France which burrowed a hole and littered in it. _See_
'Discours, Exposition des Races Canines,' 1865, p. 3.

[39] With respect to wolves burrowing holes, _see_ Richardson, Fauna
Boreali-Americana,' p. 64; and Bechstein, 'Naturgesch. Deutschlands,' b. i.
s. 617.

[40] _See_ Poeppig, 'Reise in Chile,' b. i. s. 290; Mr. G. Clarke, as
above; and Rengger, s. 155.

[41] Dogs, 'Nat. Library,' vol. x. p. 121: an endemic South American dog
seems also to have become feral in this island. _See_ Gosse's 'Jamaica,' p.
340.

[42] Low, 'Domesticated Animals,' p. 650.

[43] 'The Naturalist Library,' Dogs, vol. x. pp. 4, 19.

[44] Quoted by Prof. Gervais, 'Hist. Nat. Mamm.,' tom. ii. p. 66.

[45] J. Hunter shows that the long period of seventy-three days given by
Buffon is easily explained by the bitch having received the dog many times
during a period of sixteen days ('Phil. Transact.,' 1787, p. 253). Hunter
found that the gestation of a mongrel from wolf and dog ('Phil. Transact.,'
1759, p. 160) apparently was sixty-three days, for she received the dog
more than once. The period of a mongrel dog and jackal was fifty-nine days.
Fred. Cuvier found the period of gestation of the wolf to be ('Dict. Class.
d'Hist. Nat.,' tom. iv. p. 8) two months and a few days, which agrees with
the dog. Isid. G. St. Hilaire, who has discussed the whole subject, and
from whom I quote Bellingeri, states ('Hist. Nat. Gen.,' tom. iii. p. 112)
that in the Jardin des Plantes the period of the jackal has been found to
be from sixty to sixty-three days, exactly as with the dog.

[46] _See_ Isid. Geoffroy St. Hilaire, 'Hist. Nat. Gen.,' tom. iii. p. 112,
on the odour of jackals. Col. Ham. Smith, in 'Nat. Hist. Lib.,' vol. x. p.
289.

[47] Quoted by Quatrefages in 'Bull. Soc. d'Acclimat.,' May 11th, 1863.

[48] 'Journal de la Physiologie,' tom. ii. p. 385.

[49] _See_ Mr. R. Hill's excellent account of this breed in Gosse's
'Jamaica,' p. 338; Rengger's 'Saeugethiere von Paraguay,' s. 153. With
respect to Spitz dogs, _see_ Bechstein's 'Naturgesch. Deutschlands,' 1801,
b. i. s. 638. With respect to Dr. Hodgkin's statement made before Brit.
Assoc., _see_ 'The Zoologist,' vol. iv., for 1845-46, p.