He is chiefly known for his editions of Greek philosophical works: Heracliti Ephesii Reliquiae (1877); Prisciani Lydi quae extant (edited for the Berlin Academy in the Supplementum Aristotelicum, 1886); Aristotle, Ethica Nicomachea (1890), De Arte Poetica (1898); Contributions to the Textual Criticism of the Nicomachean Ethics (1892).