The Human Form III

Whereas "The Chapter Ends" is (presented as) the culminating installment of Poul Anderson's Psychotechnic History, "Watershed" is the undoubted culmination of James Blish's short "pantropy" future history. ("Pantropy" is the science of "Adapting" human beings to other planetary environments.) Both stories address the status of the far future Earth.

In "The Chapter Ends," Kormt thinks that the human form matters whereas, in "Watershed," it is said that humanity inheres in the mind, not in the form.

See:

The Human Form
The Human Form II