4. The abundance of minerals.
Surely these are sufficient predisposing causes for a very considerable amount of difference in the social and civilizational development.
South of Mexico we have several languages of a small and one of a large area. The former are as follows:—
Mixteca—Spoken in Oaxaca.
Zapoteca—Ditto.
Popoluca—Ditto.
Chiapa—Spoken in Chiapa.
Zoques—Spoken on the sea-coast, about Tobasco.
Tzendales—Spoken from Comitan to Palenque.
Lacandona—Chiapa.