“Trifles light as air Are to the jealous confirmations strong As proofs of holy writ;” nor is there probably any difference in the intenseness of their agony. To the lover Jealousy is not only his greatest torture, but also his deadliest enemy. With this fever in his blood even the man of the world who knows his “Ars Amoris” by heart, is apt to ruin his cause by excess of blind rivalry and clumsy passion: which perhaps explains why so many great men have been refused by their best loves. To endure and ignore a rival is, as Ovid already declared, the highest and most difficult achievement in the Art of Love; as for himself, he frankly admits, he was unequal to it. There are several ways in which lovers ruin their chances by awkward excess of passion. It makes them appear selfish and unamiable; and the pallor which Jealousy inspires is not that which makes a girl consider a man “interesting,” and leads her through pity to Love. If the lover is not yet accepted, his Jealousy arouses her opposition, because he seems to take it for granted that he has a right to be jealous, and that she will necessarily accept him. Again, his attitude repels her by suggesting that he would indulge in impertinent supervision and tyrannical dictation after marriage. Even if he has successfully proposed, she does not like to have him make his victory and prospective ownership so conspicuous by his jealous glances and manœuvres. Besides, a fascinating girl likes to preserve her apparent freedom as long as possible, and let others admire her beauty while it lasts. Most fatal is it for a man to assume a jealous attitude towards a woman before he has been able to inspire her with interest in him. Her indifference will thus be inevitably changed into positive dislike. For, as Madame de Coulanges says, “L’on ne veut de la jalousie que de ceux dont on pourrait être jalouse”—We do not desire any jealousy except from those for whom we could ourselves feel jealousy. Stendhal, who quotes this aphorism, adds a reason why women may be gratified by a display of Jealousy: “Jealousy may please proud women, as a new way of showing them their power.” And to a woman in love and in doubt, the man’s Jealousy, which is so easily detected, is of course a most welcome symptom of conquest. For Jealousy is the first sign of Love, as it is also the last. If a man is in doubt whether he is really in Love with a girl or only admires her beauty, let him observe her when talking or dancing with another man: if he then feels “queer”—from a mere uneasiness to a desire to pulverise the other fellow—he may be assured that his emotion has passed the borderline which separates disinterested æsthetic admiration from the desire for exclusive possession which is popularly known as Love.