510 



PEOCEEDINGS OP THE GEOLOGICAL SOCIETY. [Feb. 2, 



Fig. 1. — View of JoruUo and its Malpais. (From Humboldt's 



' Mexico.') 



Fig. 2.— Section of JoruUo. (After Humboldt.) 



Level of original plain. 



Fig. 3. — Plan of JoruUo and the Malpais, (After Humboldt.) 



