There is no possibility of reconciling this observation to the notion of original instincts.

And if they were founded on original instincts, coued they have any greater stability?

In all things else were they human, but their original instincts their creator's skill had failed to eliminate.

The herds here number in the dozens rather than in the hundreds but so far the animals are slowly regaining their original instincts.

Domesticated beasts of superior habits to the common will indulge themselves with a luxurious roll in carrion, for a revival of their original instincts.