The typological ideas of N.N. Strakhov
N.N. Strakhov (1828-1896) recognized natural classification of organisms basing on the reality of the boundaries between taxa. By analogy with the classification of organisms N.N. Strakhov also proposed to classify the parts, and such a classification should be directly related to the homology. The criterion of position and the criterion of continuation were offered as criteria of homology. The second criterion for establishing homology assumes to use rows of adult forms and rows of forms that reflect the stage of development in ontogenesis. Later S.V. Meyen (1935-1987) considered the classification of parts as a problem of meronomy.