Possible Clues:

• John -, nineteenth century English art critic
• John -, Victorian author, poet and artist
• Victorian writer had game to cover
• Victorian art critic John ____ wrote Modern Painters
• Victorian critic's baby now fed?
• John —. C19 art and social critic
• Art critic indicates the right American relative
• John —, English essayist and reformer
• John --, author of 'The Seven Lamps of Architecture'
• John —, English art critic and reformer