Not surprised at delay of his book [Generelle Morphologie (1866)].
P. M. Duncan taking side of evolution.
Has received paper on Geryonidae ["Über eine neue Form des Generationswechsels bei den Medusen", Monatsber. K. Akad. Wiss. Berlin (1865): 85–94]. Had often speculated on whether such a case ever occurred in nature.