Dr. Thos. W. Evans, the American dentist of Paris, has just returned from a professional visit to the Viceroy of Egypt, on board his yacht at Woolwich. The doctor describes his highness as a magnificently wealthy and a liberal and amiable prince. Among his table service are plates worth $3,000 each; a gold pitcher, not with diamonds, worth at least $500,000, and the Viceroy's toothbrush alone, not richly with precious stones, is worth at least $40,000, and the stand upon which it rests half that sum.