Class, Power and Change in a Canadian Context. 4th ed. Halifax and Winnipeg: Fernwood Publishing. Thierry, B. (2005, October 10). Integrating proximate and ultimate causation: Just one more go!, Current Science, Vol. 89 (7), 1180–1184. Lipton, Peter (1990). Contrastive Explanation. Royal Institute of Philosophy Supplement 27:247–266. Causality Evolutionary biology terminology