His chief interest in Irish was as a source of material for comparative philology.

Very enthusiastic, I remember they said you were, on certain abstruse points in comparative philology.

Max Muller called him the father of comparative philology.

He had little sympathy with comparative philology, holding that it needed a lifetime to acquire a thorough knowledge of a single language.

At the University of Chicago she undertook graduate work on comparative philology.

The comparative philology of the two languages occupied most of his later life, and he was able to show an early affinity between them.

In 1869, he returned to the University of Pennsylvania as professor of comparative philology.

His deductive approach to comparative philology was later discredited.

First, there are his own works, which largely comprise studies in comparative philology or in dialectology.

He was afterwards called to the chair of comparative philology at the University of Berlin.