Christcross-row

From infant conning of the Christ-cross-row

Source: wiktionary

For though I never attained to the outward flower of scholarship by proceeding to the learned degree of arts at either of the Universities, I gained the root and kernel of the matter at Bishop's Stortford, being able at the age of fourteen to write a fine hand, and read Eutropius, and Cæsar, and teach the horn-book and Christ-Cross to younger boys.

Source: wiktionary