Conversation so far:
When did Christopher Reeve go to Cornell?
Christopher Reeve attended Cornell University, in Ithaca, New York from 1970-1974.
What did Christopher Reeve study?
Christopher Reeve double majored in English and music theory at Cornell.
Was Christopher Reeve successful?
Christopher Reeve was a talented all-around athlete and his Superman film grossed $300,218,018 worldwide.
Were Christopher Reeve's professors impressed by his success?

Question: What did the letter say?
Self-contained rewrite: What did the Hesseltine's letter to Christopher Reeve say?