Plan of the Essay, 461. Opinions of philosophers: of Menedemus, Ariston, Zeno, Chrysippus, 462. Opinion of Plato, 464; of Aristotle, 465. The soul has a twofold nature, 463. It is composed of intellect or reason, and the passions, 465. The reason and an intelligent judgment must govern, 466. The passions by long training becoming subject to the reason, the result is MORAL VIRTUE, 468. Science and Prudence, what, and their objects, 469. How science and prudence differ, 469, 470. Prudence has need of deliberation, 470. It corrects the excesses and defects of passion, 470. Moral virtue is the mean between excess and defect, 471. Yet it needs the ministry of the passions, 471. Mean and mediocrity not the same thing, 471. The idea further illustrated, 472. Continence distinguished from temperance, 473. Incontinence and intemperance, 474. Illustrations, 475, 476. Moral virtue is firm and immovable, 478. The passions are subject to frequent and sudden changes, 478. When reason is overborne by passion, there is a sense of guilt, 479. Reason is not at variance with itself, 480. The soul is at peace, where passion does not interpose, 480. Reason tends to what is true and just, 480. Reason, left to itself, embraces the truth, 481. It is often hindered by passion, 481. Reason and passion often divide the soul, 482. They often harmonize and concur, 483. Some philosophers affirm that reason and passion do not materially differ, 478. Their opinions controverted, 479, et seq. Their improper use of terms, 484. The passions differ with their occasions, 486. Men may mistake in their judgments, 487. The passions, deriving their strength from the body, are powerful in the young, 489. The state of the body corresponds with the state of the passions, 490. We should not seek to exterminate the passions, but to regulate and control them, 490. The passions have their proper use, 491. These considerations are of importance in the government of States, and in the education of the young, 493, 494. NATURAL QUESTIONS BY R. BROWN, M.L.