Note 23 — Chapter II
Reading edition
For a good historical account of the gradation theories see Thienemann's paper in the Zoologische Annalen (Würzburg) iii., pp. 185-274, 1910, from which the quotation from Robinet is taken.
Reading edition
For a good historical account of the gradation theories see Thienemann's paper in the Zoologische Annalen (Würzburg) iii., pp. 185-274, 1910, from which the quotation from Robinet is taken.