APPENDIX. 



NOTES. 



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

 barometer, are extracted from tables calculated, after the complete form- 

 ula of La Place, by M. F. Delcros, contained in a volume of meteoro- 

 logical tables prepared by Arnold Guyot, and published by the Smith- 

 sonian Institution. 



Those due the indications of the boiling point apparatus are taken 

 from a table in the same volume, calculated by Regnault, 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 Mariano Rivero, 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 embarkation on the Huallaga. The dis- 

 tance from Callao to this point, by our route, is 337 miles. The distance 

 hence to the Atlantic is 3,682. If we add to these sums the 90 miles 

 of travel from Tarma to Fort San Ramon and back, with the 626 from 

 the' mouth of the Ucayali to Sarayacu and back, we shall have the 

 whole distance travelled over — -1,715 miles. 



