Conversation so far:
Did anything interesting happen in Havelock Ellis' early life?
In April 1875, Havelock Ellis sailed on his father's ship for Australia; soon after his arrival in Sydney.
Was Havelock Ellis ever a teacher?
Havelock Ellis obtained a position as a master at a private school.

Question: What did he teach about?
Self-contained rewrite: What did Havelock Ellis teach about?