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form or brain very hard to define. — Consider the acquirement of instinct by dogs, would show habit. —
Take the case of Jenners Hyaena Jackall.¹ — an animal not destined by nature to exist. & carrying like other hybrids with the it the provision for death. — can we deny that brain would be intermediate like rest of body? Can we deny relation of mind & brain. Do we deny the mind of a greyhound & spaniel, differs from their brains
then can we deny that the grand child dug for mice from some peculiarity of structure of brain.? — is this more wonderful than memory, affected by diseases. &c &c, double consciousness? What other explanation — can we suppose some essence.

1. Jenner, quoted in Hunter, John, The Works of John Hunter, F.R.S., with Notes, James F. Palmer, ed., 4 vols., Longman, London, 1885–1837, 1837, Vol. 4, pp. 329–330: "The following account from Mr. Jenner, of Berkeley, to whom I gave a second remove, viz., three parts dog, is very descriptive of this propensity [i.e., to fall back into original instinctive principles]: 'The little jackal-bitch you gave me is grown a fine handsome animal; but she certainly does not possess the understanding of common dogs. She is easily lost when I take her out, and is quite inattentive to a whistle. She is more shy than a dog, and starts frequently when a quick motion is made before her . . . her favourite amusement is hunting the field-mouse, which she catches in a particular manner."

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Habits import to Bowen

The facts about crossing races of dogs on their instincts, most important, because they obey the same laws, as the crossing of jackall & Fox & wolf & dog. — the only test this is most important: can there be stronger analogy that the tendency to hybrid greyhound to hunt hares. & leave the sheep & jackall to skulk about & hunt mice — Jenners Jackall Have we somewhat right to deny identity of instinct. — ¹

no one doubts that a cross of bull dogs. increase the courage & staunchness of greyhounds. — bull-dogs being preferred from not having any smell.² —

1. A circle, i.e., a large O, is drawn here. At the beginning of this page are four words penciled in—"Habits useful to B—" (last word illegible).
2. See "Questions for Mr. Wynne." Rice Wynne (1777-1846), Apothecary and surgeon. Friend of CD's father. 1822 Mayor of Shrewsbury. Bred horses and Malay fowl. Before 1839 CD addressed some questions on animal breeding to Wynne. See also F1582 and "Mr Wynne Doubts about Irish Horses hereditarily jumping" (DAR205.11.37). Paul van Helvert & John van Wyhe, Darwin: A Companion, 2021.