Which preposition to use with michaelis

in Occurrences 1%

*** "When a German travels round the world," said Dr. MICHAELIS in a lecture delivered twenty-five years ago, "he cannot help being terribly envious of England."

on Occurrences 1%

Michaelis on the New Testament had fallen into my hands several years before, and I had found the greatest advantage from his learning and candour.

Which preposition to use with  michaelis