The Foundations of the Origin of SpeciesNote {321} — Chapter IV · ON THE NUMBER OF INTERMEDIATE FORMS REQUIRED ON THE THEORY OF COMMON DESCENT; AND ON THEIR ABSENCE IN A FOSSIL STATEReading editionOrigin, Ed. i. p. 290, vi. p. 425.◇Copy noteReturn to CHAPTER IV ON THE NUMBER OF INTERMEDIATE FORMS REQUIRED ON THE THEORY OF COMMON DESCENT; AND ON THEIR ABSENCE IN A FOSSIL STATE