captain's biscuit

“In these we can see her anxiously nursing him through childish ailments, taking him out for his daily walk to Duppas Hill with a captain's biscuit in her muff, for fear he should be hungry by the way; we hear her teaching him his first lessons, with astonishment at his wonderful memory, and glorying with Nurse Anne over his behaviour in church; and all these things she retails in gossiping letters to her husband, while Mr. Richard Gray gives two-year-old John “his first lesson on the flute, both sitting on the drawing-room floor, very deeply engaged.””

The Life of John Ruskin