For love, thou know'st, is full of jealousy. --_Shakspere_. Jealousy may exist apart from sexual love, but there can be no such love without jealousy, potential at any rate, for in the absence of provocation it need never manifest itself. Of all the ingredients of love it is the most savage and selfish, as commonly witnessed, and we should therefore expect it to be present at all stages of this passion, including the lowest. Is this the case? The answer depends entirely upon what we mean by jealousy. Giraud-Teulon and Le Bon have held--as did Rousseau long before them--that this passion is unknown among almost all uncivilized peoples, whereas the latest writer on the subject, Westermarck, tries to prove (117) that "jealousy is universally prevalent in the human race at the present day" and that "it is impossible to believe that there ever was a time when man was devoid of that powerful feeling." It seems strange that doctors should disagree so radically on what seems so simple a question; but we shall see that the question is far from being simple, and that the dispute arose from that old source of confusion, the use of one word for several entirely different things. RAGE AT RIVALS It is among fishes, in the scale of animal life, that jealousy first makes its appearance, according to Romanes. But in animals "jealousy," be it that of a fish or a stag, is little more than a transient rage at a rival who comes in presence of the female he himself covets or has appropriated. This murderous wrath at a rival is a feeling which, as a matter of course a human savage may share with a wolf or an alligator; and in its ferocious indulgence primitive man places himself on a level with brutes--nay, below them, for in the struggle he often kills the female, which an animal never does. This wrath is not jealousy as we know it; it lacks a number of essential moral, intellectual, imaginative elements as we shall presently see; some of these are found in the amorous relations of birds, but not of savages, who are now under discussion. If it is true that, as some authorities believe, there was a time when human beings had, like animals, regular and limited annual mating periods, this rage at rivals must have often assumed the most ferocious aspect, to be followed, as with animals, by long periods of indifference.[16] WOMEN AS PRIVATE PROPERTY