any likeness among them is the source of affection. An ox confin'd to a park with horses, will naturally join their company, if I may so speak, but always leaves it to enjoy that of his own species, where he has the choice of both.
The affection of parents to their young proceeds from a peculiar instinct in animals, as well as in our species.
'Tis evident, that sympathy, or the communication of passions, takes place among animals, no less than among men. Fear, anger, courage and other affections are frequently communicated from one animal to another, without their knowledge of that cause, which produc'd the original passion. Grief likewise is receiv'd by sympathy; and produces almost all the same consequences, and excites the same emotions as in our species. The howlings and lamentations of a dog produce a sensible concern in his fellows. And 'tis remarkable, that tho' almost all animals use in play the same member, and nearly the same action as in fighting; a lion, a tyger, a cat their paws; an ox his homs; a dog his teeth; a horse his heels: Yet they most carefully avoid harming their companion, even tho' they have nothing to fear from his resentment; which is an evident proof of the sense brutes have of each other's pain and pleasure.
Every one has observ'd how much more dogs are animated when they hunt in a pack, than when they pursue their game apart; and 'tis evident this can proceed from nothing but from sympathy. 'Tis also well known to hunters, that this effect follows in a greater degree, and even in too great a degree, where two packs, that are strangers to each other, are join'd together. We might, perhaps, be at a loss to explain this phænomenon, if we had not experience of a similar in ourselves.
Envy and malice are passions very remarkable in animals. They are perhaps more common than pity; as requiring less effort of thought and imagination.
