In the studies relating to the submarine valleys and plateaus of the West Indian waters which resulted in the contribution entitled “Reconstruction of the Antillean Continent,”* the suggestion that the drainage of the basin of what is now the Gulf of Mexico crossed the Tehuantepec isthmus into the Pacific ocean seemed so probable that the writer visited the region early in 1895, in order to ascertain if the hypothesis was sustained by the physical and geological features of Mexico. The results were so confirmatory that the phenomena will be briefly described here.
A coastal plain similar to that of the Atlantic states forms a zone in front of the Mexican plateau. It is simply a continuation of that of Texas. On leaving the coast, the inclination of the plain is often uniform and so gradual that the rise is scarcely . . .