1892 
»V .« 
Tlalpam 
(Mexico) 
but had lost it on a rocky hillside. Three of them started to go up 
to ray assistant in a suspicious manner on the mountain one day and he 
threw the muzzle of his gun in their faces whereupon they took to 
their heels, 
• i 
Above the village of Ajuspo, at at least 10,000 feet, I was sur- 
I 
t 
prised to find Dipodomys phil^lipfeii not uncommon in the sandy ground 
close up to the min base of We aouutain. 
1 1 
•) J 
The country was much drief than at the same altitude on Las Cruces 
at Salazar, 
The Volcano of Ajusco is a crater situated at about the same alti¬ 
tude as the village just at north base of the mountain proper which 
rises some 2,000 feet above it and is not a volcano at all. This is 
another example of the fact that I noted at the volcano of Colima, 
The Sierra Bevada of Colima is the main mountain and is not a volcano, 
**/- ^ 
The volcano rising on the southern base of the main mountain at an 
altitude of about 7,000 feet and has built up a cone to over 12,000 
feet being still a couple of thousand feet below summit of main mount¬ 
ain* At Ajusco the volcano cone and cfater are at north base of 
mountain and its energy was mainly spent in pouring out the great lava 
bed which flews down to Tlalpam and San Angel, with the ashes that lie 
along the ©astern border of the upper part of the lava bed. 
In further illustration of this subsidary character of volcanoes 
is the fact that Iztaccihuati is not a volcano bub is a rugged mass of 
porphyry rising to an altitude of a little Over 17,000 feet with the 
cone of Popocatepetl lying just at the southern end of the long, high 
porphyry ridge of which Iztaccihuati is the culmination. The summit 
of Popocatepetl has built itself up by successive eruptions.from a 
considerably lower elevation than the peak of Iztaccihuati until it 
is now some 700 feet high®**. 
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