otes, more truth than the adherents of that school find
pleasant to hear.

More interesting, however, than Huxley's geological pedigree of the
horse is Haeckel's geological pedigree of man. One who reads Haeckel's
_Natural History of Creation_ can hardly escape the impression that
the author had actually seen specimens of each of the twenty-one
ancestral forms of which his pedigree of man is composed. Such,
however, was not the case. Quatrefages, speaking of this wonderful
genealogical tree which Haeckel has drawn up with such scientific
accuracy of description, observes: "The first thing to remark is that
_not one_ of the creatures exhibited in this pedigree has ever been
seen, either living or in fossil. Their existence is based entirely
upon theory." (_Les Emules de Darwin_, ii. _p._ 76). "Man's pedigree as
drawn up by Haeckel," says the distinguished savant, Du Bois-Reymond,
"is worth about as much as is that of Homer's heroes for critical
historians."

In constructing his genealogies Haeckel has frequent recourse to his
celebrated "Law of Biogenesis." The "Law of Biogenesis" which is the
dignified title Haeckel has given to the discredited recapitulation
theory, asserts that the embryological development of the individual
(ontogeny), is a brief recapitulation, a summing up, of the stages
through which the species passed in the course of its evolution in the
geologic past, (phylogeny). Ontogeny is a brief recapitulation of
phylogeny. This, says Haeckel, is what the "fundamental Law of
Biogenesis" teaches us. (The reader of Haeckel and other Darwinians
will frequently find laws put forward to establish facts: whereas other
men of science prefer to have facts establish laws). When, therefore,
as Quatrefages remarks, the transition between the types which Haeckel
has incorporated into his genealogical tree, appears too abrupt, he
often betakes himself to ontogeny and describes the embryo in the
corresponding interval of development. This description he inserts in
his genealogical mosaic, by virtue of the "Law of Biogenesis."

Many theories have been constructed to explain the phenomena of
embryological development. Of these the simplest and least mystical is
that of His in the great classic work on embryology, "Unsere
Koerperform." His tells us: "In the entire series of forms which a
developing organism runs through, each form is the necessary antecedent
step of the following. If the embryo is to reach the complicat