Comments on Insectivorous plants.
Describes his own work on fossil flora of Eastern Siberia.
Discusses genus Ginkgo.
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Comments on Insectivorous plants.
Describes his own work on fossil flora of Eastern Siberia.
Discusses genus Ginkgo.
Thanks for work on Fossil arctic flora.
Comments on Forms of flowers.
Describes his work on fossil plants collected in the Arctic.
Notes work on Ginkgo.
Thanks OH for two memoirs on the fossil flora of Bear Island and Spitzbergen [K. Svensk. Vetensk. Akad. Handl. 8 (1869) no. 7; 9 (1870) no. 5].
Comments on his Flora fossilis Arctica [vol. 3 (1875)]. Discusses successive appearance of plant families in geological periods. Relates plant development to rise of herbivorous mammals.
Comments on death of Charles Lyell.
Thanks OH for his book [see 9876]; agrees that the sudden appearance of many dicotyledons in the Upper Chalk is a perplexing phenomenon for the evolutionist.
Discusses his work [Flora fossilis Arctica, vol. 4, pt 1 (1876)].
Sends copy of [Fossile Pflanzen von Sumatra (1874)]. Comments on climate in Tertiary period, especially on Sumatra.
Comments on theory of Thomas Belt concerning climatic change in ice age.