Conversation so far:
What scientific research did Marie Stopes do?
she studied coal and coal balls and researched the collection of Glossopteris (Permian seed ferns).
Was her research on coal ever published?
This was an attempt to prove the theory of Eduard Suess concerning the existence of Gondwana or Pangaea.
Did she prove the theory of Eduard Suess?
Stopes's passion to prove Suess's theory led her to discuss the possibility of joining Scott's next expedition to Antarctica.
She did not join the expedition.
Did Stopes do any other research?
In 1907, Stopes went to Japan on a scientific mission.

Question: What research did Stopes do in Japan?
Self-contained rewrite: What research did Stopes do in Japan?