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all the compound passions, which proceed from a mixture of love and hatred with other affections, no one better deserves our attention, than that love, which arises betwixt the sexes, as well on account of its force and violence, as those curious principles of philosophy, for which it affords us an incontestable argument. 'Tis plain, that this affection, in its most natural state, is deriv'd from the conjunction of three different impressions or passions, viz. The pleasing sensation arising from beauty; the bodily appetite for generation; and a generous kindness or good-will. The origin of kindness from beauty may be explain'd from the foregoing reasoning. The question is how the bodily appetite is excited by it.

The appetite of generation, when confin'd to a certain degree, is evidently of the pleasant kind, and has a strong connexion with all the agreeable emotions. Joy, mirth, vanity, and kindness are all incentives to this desire; as well as music, dancing, wine, and good cheer. On the other hand, sorrow, melancholy, poverty, humility are destructive of it. From this quality 'tis easily conceiv'd why it shou'd be connected with the sense of beauty.

But there is another principle that contributes to the same effect. I have observ'd that the parallel direction of the desires is a real relation, and no less than a resemblance in their sensation, produces a connexion among them. That we may fully comprehend the extent of this relation, we must consider, that any principal desire may be attended with subordinate ones, which are connected with it, and to which if other desires are parallel, they are by that means related to the principal one. Thus hunger may oft be consider'd as the primary inclination of the soul, and the desire of