A complete genealogy would form what is known as a natural classification.
A natural classification of the Hydroidea has yet to be put forward.
He owed something to Cuvier, yet he knew how to utilize the work in anatomy offered by Cuvier in making a natural classification.
The most natural classification was, no doubt, that according to the color of the skin.
The idea of transformism is already in germ in the natural classification of organized beings.
But the Darwinian is searching for a natural classification.
And the natural classification gave the order not only of geological succession but also of stages of embryonic development.
No attempt is made at a natural classification, but the allied forms are generally placed in close proximity.
Under the natural classification of plants the almond belongs to the order Rosace, and in the tribe Drupace.
To find common principles of causation, therefore, constitutes the verification of every natural classification.
any event or force of nature that has catastrophic consequences, such as avalanche, earthquake, flood, forest fire, hurricane, lightning, tornado, tsunami, and volcanic eruption