Their principal function is to bring about the removal of foreign, dead or degenerating material.
The Poland-China, the most popular breed in the United States, is thus degenerating.
The main roads centring in Seoul are seldom fit even for the passage of ox-carts, and the secondary roads are bad bridle-tracks, frequently degenerating into "rock ladders."
He did all that was in his power to do to prevent his authority from degenerating into tyranny.
For although there was at that time a recognized poetical style, already degenerating to mannerism, a developed prose style did not exist.
