150 SIX MONTHS IN MEXICO. 



Mexico : they were of a new species, and I 

 therefore brought home specimens of them. 

 In descending I also found some ornamental 

 pieces of earthenware, one of which is in re- 

 lief, much resembling those of China, the 

 other represents a grotesque human face. On 

 the north-east side, about half way down, at 

 some remote period, an opening has been at- 

 tempted. This should have been made from 

 the south to the north, and on a level with the 

 ground, or a very few feet above it ; as all 

 the remains of similar buildings have been 

 found to have had their entrances in that di- 

 rection. Dr. Oteyza, who has given us the 

 measure of these pyramids, makes the base of 

 the largest six hundred and forty-five feet in 

 length, and one hundred and seventy-one in 

 perpendicular height. I should certainly con- 

 sider that the latter measurement is consider- 

 ably under the mark, and that its altitude 

 must be half its breadth. As to the age of 



