| | | | | \--v-/ Brittanese | | | | | +Latins+ Gaels | \----v----/ | | | | | | +Sclavonians+ | | | | | | | | | \--v--/ \----v-----/ | | | Italians +Kelts+ \------v------/ | | | +Sclavo-Letts+ | | | | | \--------v---------/ | | +Italo-Kelts+ \--v-----------------/ | +Sclavo-Germans+ +Albanese+ +Greeks+ | | | | | | | | | | \----v-----/ | | +Primæval Thracians+ | | +Indians+ | | | | +Iranians+ \-------v-------/ | | | +Græco-Romans+ | \---v--/ | | +Arians+ | | | | | \-----v----------/ | +Ario-Romans+ | | \-------v-------/ +Indo-Germans+ On the other hand, a branch of the Mongols migrated from north-eastern Asia to America, which was probably in earlier times connected with the former continent by a broad isthmus. The Arctic tribes, or Polar men, the Hyperboreans of north-eastern Asia, and the Esquimaux of the extreme north of America, must probably be regarded as an offshoot of this branch, which became peculiarly degenerated by unfavourable conditions of existence. The principal portion of the Mongolian immigrants, however, migrated to the south, and gradually spread over the whole of America, first over the north, later over South America.