142 The Andes a^b the Amazon. 



Yana-urcu and Cotocachi. Yana-iircu, or " black mount- 

 ain," is a mass of calcined rocks. Cotocachi (from cotaf 

 and cachi, salt) is always snow-clad. On its side is Cuy- 

 cocha, one of the highest lakes in the woi-ld (10,200 feet), 

 and formed by the subsidence of a part of the volcano. 



