of the last impressions made on the brain at night, indicating the activity and fixity of the cerebral changes of nutrition during the quiescence of sleep. All that we observe of these processes shows us that different physical changes are produced in the brain by different classes of ideas, and that the moral sense itself may be affected by the constant exercise of the brain in one direction or another, so that the actual individual standard of what is right or what is wrong will be quite changed, according to whether low or high ideas have been constantly recorded in the retentive substance of the brain. These important facts have a wide and constant bearing on education, showing the really poisonous character of all licentious literature, whether ancient or modern, and its destructive effect on the quality of the brain. It is necessary, therefore, to prepare the young mind to shrink repelled from the debasing literature with which society is flooded, and which is one of the greatest dangers to be encountered. The great help towards this object is the cultivation of strong intellectual and moral tastes in children, the preoccupation of the mind with what is good. Truth should be in the field before falsehood. All children and youth are fascinated by narratives of adventure, endurance, heroism, and noble deeds. The home library should be selected in order to brace the mind and character, and enlist the interest of the child or youth in what is manly and true. Every child also has some special taste or tendency which can be found out, if carefully looked for. It may be for art, for science, for construction, for investigation, adventure, or beneficence; but whatever it be, it may be made the means of intellectual and moral growth. The special youthful tendency is of extreme value, as indicating the direction in which a taste, even if slightly marked, may be cultivated into a serious interest and become a powerful help in the formation of character. The study of natural science and of all pursuits which develop a love and observation of Nature are of great value in education. Such pursuits have the additional advantage of promoting life in the open air. The weighty testimony in favour of the beneficial influence of outdoor exercises and amusements has already been noted. All experience shows us that the calling of the great muscular apparatus of the human body into constant vigorous life is an indispensable means for securing the healthy, well-balanced growth of the frame, and for preventing the premature development of the sexual faculty. It is a subject worthy of the especial study of parents in relation to the education of both sexes. Abundant exercise in the fresh air, with total abstinence from alcoholic drink, may be considered the two great physical aids to morality in youth.