Thus, then, for those men of the middle ages, for those Christians of lively susceptibility, but who yet knew not how to read, the clergy provided rondes-bosses, bas-reliefs, and pictures, where science on the one hand and doctrine on the other were personified. A sculptured arch in the porch of a church, or an historical glass painting in the nave presented the ignorant with a lesson, the believer with a sermon,—a lesson and a sermon which reached the heart through the eyes instead of entering at