cation and the substitution of used up cells in the full grown animal is brought about similarly. To call such a process "composition" and to speak of the term "evolution" as a purely imaginary term belongs to one who does not know anything of the matter, hard as it is to imagine such ignorance at this date.
We have still somewhat to say with respect to Herr Duehring's views of life in general. Elsewhere he sets forth the following statement with respect to life. "Even the inorganic world is a self-regulated system but one may undertake to speak of life in the proper sense first when the organs and the circulation of matter through special separate channels from a central point to another germ collection of a minor formation begin."
If life begins where the separate organs begin then we must hold all Haeckel's protozoa (Protistenreich) and probably many others as dead; all organisms at least up to those composed of one cell and those included are not capable of life. If the means of circulation of matter through different channels is the distinguishing mark of life we must place outside of this definition all the upper classes of the colenterata entirely, with the exception of the medusae, and therefore all the polypi and other plant animals are also to be considered as being outside the class of living creatures. And if the circulation of matter through different canals from an inner point is the distinguishing characteristic of life we must reckon all animals as dead which either have no heart or several hearts. Besides these there belong also to this category all worms, starfish and ringed creatures (annuloids and annulous according to Huxley's definition) a portion of the shell fish, crabs, and finally a vertebrate animal, the lancelet (amphioxus) and all plants.
