23. General Character of the Period of Adolescence.—The Intermediate age ushers in a time known as adolescence, including the years approximately from twelve to twenty-four, during which life passes from childhood to maturity. The period is marked by the development of new physical powers, new emotions, new ideals and conceptions of life, and a new spiritual consciousness. The change from the old life to the new, from the narrow to the broad, from interests selfish and small to interests as far-reaching as the world and eternity, is often accompanied by more or less upheaval in the soul and this period of re-adjustment may be a time of "storm and stress."
Two facts out of the many suggest the critical nature of adolescence:
(1) During these years the pupil is most susceptible to the power of influence. It does not touch his life simply as an impression, but as an impelling, determining force inciting him to action.
(2) Life rarely changes in its tendencies and character after full maturity has come. There is a physical reason for this in the hardening of the brain which fixes the pathways of habit and renders new lines of thought and action difficult. Therefore, in all probability as life emerges from adolescence will it enter eternity.
24. General Characteristics of the Intermediate Age.—Many of the characteristics of the Junior age are still evident, though modified by fuller development. Physical energy has increased and the mind has greater power, especially in its ability to reason. No disillusioning has come to destroy the old hero-worship, but with even more intensity each life clings to that one who embodies its aspirations. The hunger for general reading reaches its climax in this period, to be succeeded by specialized interest in lines determined by the taste of the individual.
Lacking still the self-control of manhood, breaking from the old life and dimly apprehending as yet the meaning of the new, under the domination of impulse and influence as well as of dawning conviction, the Intermediate age offers particularly trying problems with its great opportunities.
25. Special Characteristics of the Intermediate Age.
(1) The functioning of new physical powers. This is one of the most significant changes in the Intermediate period, because of its physical effects and its reflex influence upon the mental and emotional life. Severe temptations often have to be met, questioning and unwise introspection, and the teacher ought to be a confidential friend as well as instructor.
(2) A condition of instability and easy excitation. The nervous system is abnormally sensitive and quickly disturbed. The mind is keyed to vigorous, intense, and often unbalanced thought, but it is in the feelings that the lack of poise is most manifest. Whether the teacher can assign causes or not, he is conscious that the emotions are a veritable tinder-box, easily kindled into a great fire by a very little matter. Superlatives, slang, and the highest pitches of enthusiasm are common experience, and because action and reaction are equal and opposite, periods of depression corresponding to those of exhilaration are almost inevitable.
(3) A new personal consciousness. There are several marked evidences of its existence.