from classification to phylogeny and the generally "unscientific" nature of systematics, but did not focus on the fundamental problem of horizontal methodology and vertical explanation. Attempts to make taxonomy more "scientific" emphasized the adoption of objective numerical methods and the avoidance of a priori weighting of characters. These attempts led to the development of the phenetic school. Classifications were to be general purpose using all characters, not special purpose (this included phylogenetic classification) using few characters. However, the uses of a general purpose classification were never really discussed in the context of mid-twentieth century biology. Additional concerns over stability of classification and the failure to see a uniform result of the various and decidedly nonuniform speciation mechanisms then known seem to have influenced these deliberations. Attempts were also made to produce classifications that more clearly reflected phylogenetic relationships. These attempts were affected by the feeling that taxonomy should become more "scientific," but otherwise they did not address the particular concerns that motivated the development of the phenetic school.From Linnaeus onwards, the development oftaxonomy can be seen as a complex interaction between groups more or less intuitively formed on the basis of rather restricted evidence and the subsequent theoretical j ustification of these groups. In the early 1800's, the general adoption of horizontal analogies in the discussion of the relationships of groups influenced the methodology of group formation. However, both the methodology and style of discussion of relationships persisted largely unchanged into the post-1859 era in which a different method of group formation and a different style of discussion were required. The tensions arising in systematics from this unperceived conflict, as well as other perceived problems with phylogenetic systematics, led to two reactions: one in some sense strengthened the connection of twentieth century taxonomy with an early nineteenth century pre-evolutionary world view, the other led to an attempt to reform taxonomy so that it became consistent with evolutionary ideas."But if he kick away the Ladder, the phylogeneticist cannot fall back on the Net: a species or genus cannot be connected in all directions: the emblem of a phylogeneticist is a Tree" (Bather, 1927, p. Ixxxiv).