4. =Celts and Iberians.=--The Iberians were followed by a swarm of new-comers called Celts. The Celts belong to a group of races sometimes known as the Aryan group, to which also belong Teutons, Slavonians, Italians, Greeks, and the chief ancient races of Persia and India. The Celts were the first to arrive in the West, where they seized upon lands in Spain, in Gaul, and in Britain, which the Iberians had occupied before them. They did not, however, destroy the Iberians altogether. However careful a conquering tribe maybe to preserve the purity of its blood, it rarely succeeds in doing so. The conquerors are sure to preserve some of the men of the conquered race as slaves, and a still larger number of young and comely women who become the mothers of their children. In time the slaves and the children learn to speak the language of their masters or fathers. Thus every European population is derived from many races. [Illustration: Bronze celt from the Isle of Harty, Kent (1/2).] 5. =The Celts in Britain.=--The Celts were fair-haired and taller than the Iberians, whom they conquered or displaced. They had the advantage of being possessed of weapons of bronze, for which even the polished stone weapons of the Iberians were no match. They burned instead of burying their dead, and raised over the ashes those round barrows which are still to be found intermingled with the long barrows of the Iberians. [Illustration: Bronze lance-head found in Ireland.] [Illustration: Bronze caldron found in Ireland.]