By Ruse, Michael Handmaiden to the Science? PHILOSOPHY OF BIOLOGY RE-ENGINEERING PHILOSOPHY FOR LIMITED BEINGS: Piecewise Approximations to Reality. William C. Wimsatt. xviii + 450 pp. Harvard University Press, 2007. $49.95. INTEGRATING EVOLUTION AND DEVELOPMENT: From Theory to Practice.

By Sober, Elliott A Philosopher Looks at the Units of Selection Evolution and the Levels of Selection. Samir Okasha. Oxford University Press, New York, 2006. 288 pp., illus. $55.00 (ISBN 9780199267972 cloth).

In a "classic" phylogenetic inference problem, the observed taxa are assumed to be the leaves of a bifurcating tree and the goal is to infer just the "topology" of the tree (i.e., the formal tree structure linking the extant taxa at the tips), not amount of time between branching events, or amount of evolution that has taken place on branches, or character states of interior vertices.