Jack's Allergy And Ayan's Choth

We must read to the end of "Rescue on Avalon," the last story in The Earth Book Of Stormgate, in search of any further information on the Ythrian social units called choths.

Despite his allergy to feathered Ythrians, Jack Birnam must approach and treat Ayan and even carry and bundle him into a sleeping bag in order to save his life. After that, neither being is in good shape but both are alive. They become "galemates" through shared suffering and struggle for survival. 

We appreciate the view through Ayan's open hospital ward window which we have described before:

lawn

tall trees: Avalonian king's-crown; Ythrian windnest; Terrestrial oak

distant snowpeaks

light from heaven

singing air

Ayan looks out wistfully. Of course. He wants to fly through that view, not just walk on the lawn.

He says that his choth will send Jack off-planet for a complete cure of his allergy and, just before that, that it is time for human and Ythrian Avalonians to mingle freely. So far, they have settled different areas in order to avoid friction especially since Ythrians are territorial. The next steps will be for some Ythrians to adopt human lifestyles, as atomic individuals in a global community, and for many human beings to join choths.

But what is a choth?