6 Annual Reports of Academy of 
The Central Railroad ascends the Andes to Aroya by means of 
a great number of tunnels and switchbacks. Branches continue 
the road to Morococha, Huancayo, Goyallarisquisqua, and Cerro 
de Pasco. Soon after leaving Lima, the fog and clouds are left 
below. At Chicla the snow-capped peaks come into view, and rap- 
idly it becomes cold. Ticlio, the summit, 15,665 feet in altitude, 
was reached late in the afternoon. I he rarity of the atmospheie 
cast a pall over the passengers, with here and there a sign ot distress, 
or perhaps a frown at the crazy gringo who insisted on keeping 
Cuzco, Peru. 
the window open. At Aroya a change of cars is made for Cerro 
de Pasco, several hours ride across the plateau. 
Cerro de Pasco is 14,500 feet in altitude, and the native town 
apparently glories in the reputation of being the dirtiest town in 
the world. 
This part of Peru contains its richest mines, for here are situated 
the important copperand silver districts, Cerro de Pasco, Morococha, 
and Casapalca; and the coal mines of Goyallarisquisqua, Quisqua- 
cancha, and Oyon. Aside from their great economic importance, 
the districts are of interest to the mineralogist because of the superb- 
ly crystallized enargite, tetrahedrite, and bournonite, which are 
frequently found. 
