Note 78 — Chapter IV

Morley [b], p. 140. In this connection (p. 144) Morley summarizes the various speculations as to the causes which led to the abandonment of the southern centres, as reduction of the land by primitive agricultural methods (Cook), climatic changes (Huntington), physical, moral and political decadence (Spinden). He adds: "Probably the decline of civilization in the south was not due to any one of these factors operating singly, but to a combination of adverse influences, before which the Maya finally gave way."