There is an old notion sometimes found among theoretical educators that the mind of a child is like a piece of paper upon which anything may be written; a mould of clay upon which any impression may be made; a block of stone in which the teacher, like the famous sculptor of old, sees, in his poetic vision, an angel, and then chips and hacks until that angel stands revealed. The theory is absurdly and dangerously fallacious. Paper and clay are not living organisms; the orator is not the statue chiselled from the rough stone of human nature, or, if the teacher succeeds in so far perverting nature as to hack and trim a human organism into the semblance of a statue, the product of his work will stand forth a living illustration of the difference between the genuine and the spurious. The stone has no life. Life must be breathed into it, and the sculptor may breathe into it such life as he chooses. The gardener, on the other hand, must obey the laws of the life of the plant he nurtures. He must so direct the forces of nature as to help its inherent tendencies. A certain line of growth is written in the structure of every species of plant. The plant may be hindered or perverted in its development; it may be killed, but it cannot be made to grow into the form of another plant. The progress of the human mind can be illustrated only by that which is vital, not by anything mechanical. Mind reacts upon whatever is given to it according to the divine laws of its own organism. The human mind, like the plant, must exhibit vitality in abundance before it finds a higher and more complex manifestation. The unskilled teacher, instead of inviting out the young pupil along the line of his own organism, may, at the outset, paralyze the unfolding mind by ill-advised dictation. There can be no true teaching which does not involve growing, and growing in the way intended by nature. The teacher must be something more than a critic. The critic establishes criteria, protects the public, and, in a measure, educates the public taste. When he is able to teach others how to reach true criteria he becomes a teacher. Until he can do this he has no place in the class room. It will be observed that the four volumes of the "Evolution of Expression" recognize the four general stages of man's development: Volume I., representing the period when the individual is engrossed with subjects or objects as a Whole, and his passion for life is expressed through rude energy, size--the Colossal; Volume II., when he delights in so presenting The Parts to which he has been attracted, as to make them Effective in attracting the attention of others; Volume III., when his appreciation of the use or Service of the Parts carries him beyond the melodramatic to the Realistic; and Volume IV., in which his dawning perception of that higher service resulting from the truthful Relationship of the Parts leads him beyond realism to idealism, the Suggestive.