Ruskin 's references in Modern Painters I are always to the 28-volume edition, published by Cadell (1834-36), with 40 steel-engraved illustrations by Turner. This was a companion edition to Cadell's 12-volume edition of The Poetical Works of Sir Walter Scott (1834), also illustrated by Turner. Ruskin frequently refers to these collectively as the illustrations to Scott.
See also Ruskin, Turner, and engraving.