(7/7.

See the admirable Appendix by Dr.Buckland to Beechey's "Voyage"; also the writings of Chamisso in Kotzebue's "Voyage.") And as so many species, both living and extinct, of these same genera inhabit and have inhabited the Old World, it seems most probable that the North American elephants, mastodons, horse, and hollow-horned ruminants migrated, on land since submerged near Behring's Straits, from Siberia into North America, and thence, on land since submerged in the West Indies, into South America, where for a time they mingled with the forms characteristic of that southern continent, and have since become extinct.
While travelling through the country, I received several vivid descriptions of the effects of a late great drought; and the account of this may throw some light on the cases where vast numbers of animals of all kinds have been embedded together.

The period included between the years 1827 and 1830 is called the "gran seco," or the great drought.

During this time so little rain fell, that the vegetation, even to the thistles, failed; the brooks were dried up, and the whole country assumed the appearance of a dusty high-road.

This was especially the case in the northern part of the province of Buenos Ayres and the southern part of St.Fe.