In his view idiocy is only a prolonged infancy, in which the infantile grace and intelligence having passed away, there remains only the feeble muscular development and mental weakness of that earliest stage of growth. He proposes to follow Nature in his processes of treatment; to invigorate the muscles by bathing and exercise, using some compulsion, if necessary, to effect this; to fix the attention by bright colors, strong contrasts, military manoeuvres, etc.; to strengthen and develope the will, the imagination, the senses, and the imitative powers, by a great variety of exercises; and at each step, to impress the mind with moral principles. The mere acquisition of a few facts, more or less, and the capacity to repeat these, parrot-like, he regards as an attainment of very little consequence; the great object should be to make the child do his own thinking, and this once attained, he will acquire facts as he needs them. Dr. Seguin met with a high degree of success in the instruction of idiotic and imbecile children, and in 1846 published a treatise on the treatment of idiocy, which will, for years to come, be the manual of every teacher of this unfortunate class. While Seguin was demonstrating the truth of his theory of instruction at Paris, Herr Saegert, a teacher of deaf mutes at Berlin, having attempted, unsuccessfully, the instruction of a deaf and dumb idiot, was led to inquire into the reasons of his failure. Without any knowledge of Seguin's labors, he arrived substantially at the same conclusions, and devoted his leisure to medical study, in order to grapple more successfully with the problem of the instruction of idiots. In 1840 he commenced receiving idiotic pupils, and has maintained a school for them in Berlin up to the present time. Herr Saegert is inclined to regard idiocy as dependent upon the condition of the brain and nervous system, to a greater extent, perhaps, than Dr. Seguin, and to rely upon medication to some extent; though in his writings he professes to consider it a condition, and not a disease.