The annals.

Abstract

It is therefore no wonder that with such frequent alterations of the system younger naturalists, who may be inclined to regard the system as the foundation of the science, find themselves at first in no small difficulty, until, subsequently, after they have penetrated more deeply into the interior of nature, and recognized the essence of zoology more accurately, they arrive at the right view, that in reality classification or taxonomy is by no means the foundation of the science, but rather only the roofing-in of the structure raised upon the foundation of morphology and embryology. As the main cause of the vacillations nowadays apparently occurring in classification we must undoubtedly regard only