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Thanks for information about Pliocene mammal. Interested in relating process of formation to duration of the species. Oswald Heer’s view that species suddenly formed surely false.
Bad summer with much sickness. Going to Malvern [for water-cure] for a month.
Muddled over phyllotaxy and made out nothing.
Sends information about Pliocene fauna of the "Forest Bed" of the Norfolk coast.
A genus described as extinct by Owen is found by E. A. I. H. Lartet to exist in Russia.
Edouard Suess attributes to Oswald Heer and HF the generalisation "That the time during which a new species is formed, is (as a rule) very short in comparison with the time during which it persistently presents the same peculiar specific characters". [Edouard Suess, "Über die Verschiedenheit und die Aufeinanderfolge der tertiären Landfaunen in der Niederung von Wien", Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften in Wien (Math-naturw. Klasse) 47 (1863): 306–31.] [See 4277.]
HF will send E. Suess’s paper [Edouard Suess, "Über die Verschiedenheit und die Aufeinanderfolge der tertiären Landfaunen in der Niederung von Wien", Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften in Wien (Math–nat. Klasse) 47 (1863): 306–31] which deals directly with natural selection.
