Next come the pleasures of _perception_ as the infant gradually observes the qualities of the various objects around, and slowly learns to distinguish its mother and its playthings from the confused mass of forms and colors. Then comes the gentle curiosity as it watches the movement of its own limbs, and finally discovers that its own volitions move its tiny fingers, while the grand idea that _it is itself a cause_ is gradually introduced. Next come the varied intellectual pleasures as the several powers are exercised in connection with the animate and material world around, in acquiring the meaning of words, and in imitating the sounds and use of language. The adult, in toiling over the dry lexicon, little realizes the pleasure with which the little one is daily acquiring the philosophy, grammar, and vocabulary of its mother tongue. A child who can not understand a single complete sentence, or speak an intelligible phrase, will sit and listen with long‐continued delight to the simple enunciation of words, each one of which presents a picture to his mind of a dog, a cat, a cow, a horse, a whip, a ride, and many other objects and scenes that have given pleasure in the past; while the single words, without any sentences, bring back, not only vivid conceptions of these objects, but a part of the enjoyment with which they have been connected. Then, as years pass by, the intellect more and more administers pleasure, while the reasoning powers are developed, the taste cultivated, the imagination exercised, the judgment employed, and the memory stored with treasures for future enjoyment. In the proper and temperate use of the intellectual powers, there is a constant experience of placid satisfaction, or of agreeable and often of delightful emotions, while no one of these faculties is productive of pain, except in violating the laws of the mental constitution. The Susceptibilities. In regard to the second general class of mental powers—_the susceptibilities_—the first particular to be noticed is the ceaseless and all‐pervading _desire to gain happiness and escape pain_. This is the mainspring of all voluntary activity; for no act of volition will take place till some good is presented to gain, or some evil to shun. At the same time, as has been shown, the desire to escape evil is more potent and effective than the desire for good. Thousands of minds that rest in passive listlessness, when there is nothing to stimulate but hope of enjoyment, will exert every physical and mental power to escape impending evil. The seasons of long‐continued prosperity in nations always tend to a deterioration of intellect and manhood. It is in seasons of danger alone that fear wakes up the highest energies, and draws forth the heroes of the race.