Mantegazza, unlike countless love writers and poets, approaches his field not with a hoe or a plow to scratch the surface of the ground, but with a powerful drill that penetrates into the lowest strata of the earth and reveals its deepest terrestrial composition. In the pursuit of his aim, carried by enthusiasm in the innermost research of facts and by admiration for the beauty of his subject, Mantegazza has used all the wealth of his literary training, skilfully and lavishly drawing upon all the resources of the Italian language. The task of the translator has thus been made doubly difficult, as the original language of the book has more subtlety and artistic abandon than the English language would allow. Rather than run the risk of betraying either the substance or the representation of the author's idea, often it has been preferred to sacrifice the turn of the English phrase to that of the corresponding Italian, and possibly incur the imputation of exoticism. Such is the translation of a beautiful Book of Love offered to the American public at a time when all the evil passions and degradations of hatred are unleashed over the world. In striking contrast with the trend of the human mind today, what a meager chance is awaiting the contemplation of a sentiment whose mission is to tie all humanity with a bond of affection! And yet, while time and evolution relegate the memory of the most fearful cataclysms of the human race to the icy page of history, the fundamental elements constituting human life cannot be changed or destroyed. Love will continue to exist as long as the laws of affinity and procreation seize the human being at his birth and by the evolution of matter dominate him even after his death. The struggle for life may become intensified or disappear from the world; hatred among classes, nations, races may deepen, expand or be altogether eliminated; passions may gain further ascendancy over humanity, or humanity may learn to control them; and, in the words of Shelley, "Fate, Time, Occasion, Chance and Change, to these All things are subject but eternal Love." At the feet of him, procreator and prince of all affections, at once proud, generous, kind, fair, and weak, avaricious, cruel, deceitful, in all virtues rich and in all sins, a king and a miser, we shall always lay, proudly or in shame, the innermost throbs of our heart, our tears and our joys, the highest aspirations of our mind, the sweetest ecstasies of our soul, our convulsions, our despairs, our crimes, up to the very threshold of the great oblivion, when, in the words of the poet, of the extenuated race one lone man and one woman, among the ruins of the mountains and of the dead woods, in the wake of the departing warmth, clasped together in the supreme fate of creation, livid, with glassy eyes shall see the last sun descend forever. ER. BE. TO THE READER