Discusses EM’s book [Die Dolomit-Riffe von Südtirol und Venetien (1878–9)]. Pleased by EM’s views of geological chronology based on evolution. Thinks distribution of land and sea formerly very different. New genera and families may have been developed on isolated tracks and migrated.

Pleased with CD’s praise of his work. He agrees with CD that intermediate marine fossils are rare in the same bed. The difficulty is overcome by extensive search of "isotopic" fauna in different beds of the same "isotopic" region.