“ANTONIO ALZATE.” 335 

It has not been my intention in the foregoing statements to genera- 
lize, as it is absolutely necessary to have an inmence amount of care- 
fully collected data, before any generalization can stand and any 
attempt thereto will only complicate the already complex questions. 
The few sections given close to the Balsas river will convey an idea 
of the general structure of that region. 
At a later date 1 hope to present further data. As to the mines and 
mineral resources of the various formations and the mineral districts, 
I am not at present prepared to present any matter. 
México, 1901. 
