• A Problem in Greek Ethics: Being an inquiry into the phenomenon of sexual inversion, addressed especially to medical psychologists and jurists
• A Problem in Modern Ethics: Being an Inquiry into the Phenomenon of Sexual Inversion, Addressed Especially to Medical Psychologists and Jurists
• New Italian sketches
• Percy Bysshe Shelley
• Renaissance in Italy, Volume 1 (of 7): The Age of the Despots
• Renaissance in Italy, Volume 3 (of 7): The Fine Arts
• Renaissance in Italy, Volumes 6 and 7 (of 7): The Catholic Reaction
• Shelley
• Sketches and Studies in Italy and Greece, Complete: Series I, II, and III
• Sketches and Studies in Italy and Greece, First Series
• Sketches and Studies in Italy and Greece, Second Series
• Studies of the Greek Poets (Vol 1 of 2)
• Studies of the Greek Poets (Vol 2 of 2)