84 



ELEVATIONS. 



From the first of March to the last of August, the climate is delight- 

 ful ; but the heavy and almost continuous rains of the other six months 

 of the year make it disagreeable, but not unhealthy. 



As we are now near the foot of the mountains, on the eastern slope, 

 I give a table of the distances and elevations of various points on the 

 route. The B. P. opposite some of the elevations show that these 

 were indicated by the temperature of boiling water: 



Places. 



Cailao 



Lima 



Pacayar 



Yanacoto 



Cocachacra , 



Moyoc 



San Mateo 



Acchahuarcu 



Pass of Antaraugra. 



Pachachaca. 

 Oroya 



Tarma 



Palca 



Matichacra 



Huacapishtana . . 

 Challuapuquio . . . 

 Fort San Ramon 



Height above the 

 level of the sea. 



Feet. 



476 

 1,346 

 2, 337 

 4,452 

 7,302 

 10, 200 

 12, 898 

 16, 044 

 16, 199 

 12, 786 

 11,654 

 11,825 

 9,738 

 8, 512 

 7,091 

 5, 687 

 3, 192 

 2, 605 

 2,953 



The barometer gave the height of a point, four miles above Tarma, 

 at eleven thousand two hundred and seventy feet. So that there is a 

 descent in these four miles of distance of one thousand five hundred and 

 thirty-five feet. The ascent, however, between Acchahuarcu and the 

 top of the hill on which we observed, at the Pass of Antarangra, is 

 steeoer than this, being three thousand three hundred and fifty-eight 

 feet in six miles. 



From Yanacoto, on the western slope of the Andes, to the top of the 

 Pass, is fifty-nine miles ; from the top of the Pass to Fort San Ramon, 

 on the eastern slope, which is two hundred and seventy feet higher than 

 Yanacoto, is eighty-eight miles. This gives the ascent of the Andes, 

 on its western slope, at 232 feet to the mile, and on its eastern slope 

 at 152. 



