“And then a miracle occurs” — weak links in the chain of argument from punctuation to hierarchy Davida E. Kellogg OriginalPaper Pages: 3 - 28
Louis Agassiz (1807–1873) and the reality of natural groups Olivier Rieppel OriginalPaper Pages: 29 - 47
Species, sets, and the derivative nature of Philosophy Leigh M. Van Valen OriginalPaper Pages: 49 - 66
Laboratory models, causal explanation and group selection James R. GriesemerMichael J. Wade OriginalPaper Pages: 67 - 96