Note 21 — Chapter I · DOMESTIC DOGS AND CATS.
Reading edition
For numerous and interesting details on the resemblance of dogs and jackals see Isid. Geoffroy St.-Hilaire ‘Hist. Nat. Gén.,’ 1860, tom. iii. p. 101. See also ‘Hist. Nat. des Mammifères,’ par Prof. Gervais, 1855, tom. ii. p. 60.