De institutione arithmetica.
De institutione arithmetica is a 1488 Latin arithmetic treatise by Boethius, printed in a densely set black-letter text for scholars and students. Its pictures are historiated initials, large decorative capitals with interlaced scrollwork, leafy tendrils and knotted ornament set in black fields beside columns of type, showing how a designer can frame a text block with a strong letter-shaped ornament.
