These discourses are not presented as a series. With the exception of the last, which was prepared merely for publication, they were delivered at considerable intervals, and to meet certain aspects of the subject as they presented themselves. As they all develop substantially the same principles, they will probably contain some repetitions. The interest awakened by the publication of the essay before the Albany Convention, and the very general desire expressed to see the second and third of these discourses in print, have decided the author against remoulding the whole into one treatise which he at one time contemplated. He therefore sends them forth in their original shape, with earnest prayer that the great Head of the church may use them, with all their imperfections, to awaken Christian thought and friendly discussion on a subject of vital importance to the welfare of our youth.

Marvin R. Vincent.

Troy, Jan.9th, 1867.