The first book of Leo Africanus, and the observations of Dr. Shaw (p. 220, 223, 227, 247, etc.), will throw some light on the roving tribes of Barbary, of Arabian or Moorish descent. But Shaw had seen these savages with distant terror; and Leo, a captive in the Vatican, appears to have lost more of his Arabic than he could acquire of Greek or Roman learning. Many of his gross mistakes might be detected in the first period of the Mohammedan history.