1
As Zittel has said: Two directions were from the first apparent in palaeontological research- astratigraphicaland a biological.
2
In fact palaeontological research has proven incapable of finding the transitions between different species, clearly determined by the theory.
3
Zittel, on palaeontological research.
4
Nearly 40,000 species of animals and plants have been added to the Systema Naturae by palaeontological research.
5
It must, therefore, be admitted that one outcome of the progress of embryological and palaeontological research for the last 50 years is negative.