APPENDIX. 



NOTES. 



The elevations due to the atmospheric pressure, as indicated by the barometer, 

 are extracted from tables calculated, after the complete formula of La Place, 

 by M. F. Delcros, contained in a volume of meteorological tables prepared by 

 Arnold Guyot, and published by the Smithsonian Institution. 



Those due the indications of the boiling-point apparatus are taken from a table 

 in the same volume, calculated by Eegnault, from his "Tables of forces of 

 vapor," published in the Annates de Physique et de Chimie, t. xiv, p. 206. 



The height of the barometer at the level of the sea is assumed at 30.00, and 

 the temperature of the air at 65° Fah. 



I have added a column of heights, measured with the barometer by Don Ma- 

 riano Eivero, at places where they compare with mine. 



At the pass of Antarangra we took our observations on the summit of a hill 

 about two hundred feet above the road at its highest point. 



Morococha is situated near the line of perpetual snow, on the eastern slope of 

 the western chain of the Andes. 



Tingo Maria is the place of embarcation on the Huallaga. The distance from 

 Callao to this point, by our route, is 337 miles. The distance hence to the At- 

 lantic is 3,662. If we add to these sums the 90 miles of travel from Tarma to 

 Fort San Eamon and back, with the 626 from the mouth of the Ucayali to 

 Sarayacu and back, we shall have the whole distance travelled over — 4,715 miles. 



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