stem-form

Here again, much of the difficulty vanishes if the morphological identity of the leaf-form and of the stem-form be admitted.

Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants Maxwell T. Masters

Even the bastard-formations either cease to be fertile, or, remaining fertile, finally return to one or the other stem-form of the originally crossed species.

The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality Rudolf Schmid

In this fact, and the fact we have already established that the Gastraea has been evolved from the hollow vesicle of the one-layered Blastaea, and this again from the original unicellular stem-form, we have obtained a solid basis for our study of evolution.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

From the common germ-form we infer a common stem-form.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

Their common stem-form is an extinct lizard-like reptile of the order of the

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

Ascidiae, that are the nearest blood-relatives of the ancient stem-form of the vertebrates.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

The Amphioxus, the lowest Vertebrate, and the Ascidia, the nearest related Invertebrate, descend from a common extinct stem-form, the Chordaea; and this must have had, substantially, the organisation of the chordula.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

All the Craniota descend from a common stem-form, and this was substantially identical in structure with the Amphioxus.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

Just as the countless species of the Metazoa do actually develop in the individual from the simple embryonic form of the gastrula, so they have all descended in past time from the common stem-form of the Gastraea.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

The unicellular form that we have in the ovum has already been described as the reproduction of a corresponding unicellular stem-form, and to this we have ascribed the organisation of an Amoeba

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876