Gibbard's evolutionary theory of rationality and its ethical implications Stephen W. Ball OriginalPaper Pages: 129 - 180
The threefold parallelism of Agassiz and Haeckel, and polarity determination in phylogenetic systematics Harold N. Bryant OriginalPaper Pages: 197 - 217
Ostensive definitions of the names of species and clades Michael T. Ghiselin Discussion Pages: 219 - 222
The definitions of species and clade names: A reply to Ghiselin Kevin De Queiroz Discussion Pages: 223 - 228