1. Classical Quarterly 12 (1962), 81–98.
2. 2. Proc. Cambr. Phil Soc. N. S. 16 (1970), 12-21
3. 3. cf. Aristotle's De Partibus Animalium I and De Generatione Animalium I (translated with Notes by D. M. Balme), Clarendon Press, Oxford, 1972, Notes on PA 1, 2 and 3.
4. PA I, 4, 644a 12ff.; cf. e. g. HA I, 1, 486a 15ff.
5. Genus, Species and Ordered Series in Aristotle’, Phronesis 7 (1962), 67–90; ’Aristotle’s Principle of Individuation’, Mind 59 (1970), 519–529.