SOURCE: A review of Systematische Phylogenie der Protisten und Pflanzen, by Ernst Haeckel, in The Monist, Vol. V, No. 3, April, 1895, pp. 451-52.

In the following essay, a critic assesses Systematische Phylogenie.

The fundamental idea of a general phylogeny of the world of organic forms was broached by Professor Haeckel in 1866 in his General Morphology, and shortly afterwards developed in a more popular form in his Natural History of Creation. As the phylogenetic materials were scanty at that period, the author's researches were limited to the merest outlines of a history of the race; in the necessity of the case a rigorous scientific demonstration was impossible. The author now attempts such a demonstration [in Systematische Phylogenie der Protisten und Pflanzen.], in the light of the materials recently furnished by palæontology, ontogeny, and morphology. Thus, the reader will find incorporated here the results of thirty years of fruitful research...