The author begs leave to add, that, as the lec tures were designed for popular and promiscuous audiences, and pertained to a cause in which but very little general interest was felt, he was con strained not only to confine himself to populartopics, but also to treat them, as far as he was able, in a popular manner. The more didactic expositions of the merits Of the great cause of Education, and some of the relations which that cause holds to the interests of civilization and hu man progress he has endeavored to set forth in his Annual Reports; while his more detailed and Specific views, in regard to modes and processes of instruction and training, may be found in the volumes of the Common School Journal. Each one Of these three channels of communication with the public, he has endeavored to use for the exposition of a particular class of the views and motives, belonging to the comprehensive subject of education.