“*Entelechy*” But shall we not give a name to our vitalistic or autonomous factor *E*, concerned in morphogenesis? Indeed we will, and it was not without design that we chose the letter *E* to represent it provisionally. The great father of systematic philosophy, Aristotle, as many of you will know, is also to be regarded as the founder of theoretical biology. Moreover, he is the first vitalist in history, for his theoretical biology is throughout vitalism; and a very conscious vitalism indeed, for it grew up in permanent opposition to the dogmatic mechanism maintained by the school of Democritus. Let us then borrow our terminology from Aristotle, and let that factor in life phenomena which we have shown to be a factor of true autonomy be called *Entelechy*, though without identifying our doctrine with what Aristotle meant by the word έντελέχεια. We shall use this word only as a sign of our admiration for his great genius; his word is to be a mould which we have filled and shall fill with new contents. The etymology of the word ἐντελέχεια allows us such liberties, for indeed we have shown that there is at work a something in life phenomena “which bears the end in itself,” ὃ ἔχει ἐν ἑαυτᾣ τὸ τέλος. Our concept of entelechy marks the end of our analysis of individual morphogenesis. Morphogenesis, we have learned, is “epigenesis” not only in the descriptive but also in the theoretical sense: manifoldness in space is produced where no manifoldness was, real “evolutio” is limited to rather insignificant topics. But was there nothing “manifold” previous to morphogenesis? Nothing certainly of an *extensive* character, but there was something else: there was entelechy, and thus we may provisionally call entelechy an “*intensive manifoldness*.” That then is our result: not evolutio, but epigenesis--“epigenesis vitalistica.” *Some General Remarks on Vitalism*