It is often the case that a sick or injured animal withdraws and hides himself from the herd; the instinct of the "stricken deer" this might be called. But I do not think that we need assume that the ailing individual goes away to escape the danger of being ill-used by his companions. He is sick and drooping and consequently unfit to be with the healthy and vigorous; that is the simplest and probably the true explanation of his action; although in some cases he might be driven from them by persistent rough usage. However peaceably gregarious mammals may live together, and however fond of each other's company they may be, they do not, as a rule, treat each other gently. Furthermore, their games are exceedingly rough and require that they shall be in a vigorous state of health to escape injury. Horned animals have no buttons to the sharp weapons they prod and strike each other with in a sportive spirit. I have often witnessed the games of wild and half-wild horses with astonishment; for it seemed that broken bones must result from the sounding kicks they freely bestowed on one another. This roughness itself would be a sufficient cause for the action of the individual, sick and out of tune and untouched by the glad contagion of the others, in escaping from them; and to leave them would be to its advantage (and to that of the race) since, if not fatally injured or sick unto death, its chances of recovery to perfect health would be thereby greatly increased. It remains now to speak of that seemingly most cruel of instincts which stands last on my list. It is very common among gregarious animals that are at all combative in disposition, and still survives in our domestic cattle, although very rarely witnessed in England. My first experience of it was just before I had reached the age of five years. I was not at that early period trying to find out any of nature's secrets, but the scene I witnessed printed itself very vividly on my mind, so that I can recall it as well as if my years had been five-and-twenty; perhaps better. It was on a summer's evening, and I was out by myself at some distance from the house, playing about the high exposed roots of some old trees; on the other side of the trees the cattle, just returned from pasture, were gathered on the bare level ground. Hearing a great commotion among them, I climbed on to one of the high exposed roots, and, looking over, saw a cow on the ground, apparently unable to rise, moaning and bellowing in a distressed way, while a number of her companions were crowding round and goring her.