Polytechnic Institute, in its either partial or entire form, should exist entirely independent of all other influences, we might be held excused from any mention of such scientific schools as are attached to our Universities. That of Cambridge, Massachusetts, would, however, deserve special mention, from the celebrity of its teachers. In this institute, which has between seventy and eighty students, we have a single school divided into the following departments: that of Chemistry, under supervision of Professor Horseford, in which instruction is both theoretical and practical; that of Zoölogy and Geology, in which the teaching consists alternately of a course of lectures by Professor Agassiz, on Zoology, embracing the fundamental principles of the classification of animals as founded upon structure and embryonic development, and illustrating their natural affinities, habits, distribution, and the relations which exist between the living and extinct races, and a course of geology, both theoretical and practical. To this are added the departments of Engineering under Professor Eustis, that of Botany, under Professor Gray, that of Comparative Anatomy and Physiology, under Professor J. Wyman, that of Mathematics, under Professor Peirce, and that of Mineralogy, under Professor Cooke. It is needless to speak in praise of a school boasting men of such world-wide names as teachers, or to commend it as affording facilities for bestowing a sound education. We do it no injustice, however, in asserting that its tendency is to develop students of abstract science and teachers, while the aim of the _Polytechnic_ school proper is, in addition to this, to supply the manufactures of the country with _working men_, and the country at large, including those already engaged in labor, with technological information of every kind. It should be a vast reservoir of practical knowledge, where the man of the 'print-works,' in search of a certain dye or of a new form of machinery, may apply, certain that all the latest discoveries will be found registered there. It should be a place where capitalists may go as to an intelligence-office, confident of finding there the assistants which they may need. It should be, in fact, in every respect, an institute simply and solely for the people, and for the development of _manufacturing industry_. If, as we have urged, it should embrace eventually thorough instruction in _every_ branch of knowledge, this should be because experience shows that the most commonplace branches require the stimulus of genius, which can only be fairly developed by universal facilities. No young man, however practical, could have his _Thätigkeit_ or 'available energy' other than stimulated by even an extensive familiarity with every detail of philosophy, literature, and art, provided that these were properly _scienced_, or taught strictly according to their historical development.