OBSERVATIONS ON THE ANDES. 169 



We had now, for a very long period, been sail- 

 ing about in the finest of all possible climates, 



Whence the base stretches N. 36^ 52' W. 50 miles long. 



or = 57,53 Eng. miles. 



23cl, True bearing of W. peak N. 52^ 28' 58" E. 



Angle subtended by the two peaks 8 10 12 



23d, True bearing of E. peak N. 60« 39' 0" E. 



23d, Alt. west peak, observed 1^ 15' 55' 



23d, Alt. east do. 16 12 



Height of the observer's eye 16 feet. 

 Barom, 29,90. Therm. Si^, 

 24th, True bearing of western peak N. 85*^ 40' E. 

 Angle subtended by the peaks 3 44 



24th, True bearing of eastern peak N. 89*^ 24' E. 



24th, Alt. W. peak, observed 0 59 12'' 



24th, Alt. E. do. 0 45 17 



Height of the observer's eye 16 feet, 



Barcm. 29,95. Thermom. 80"*. 

 Lat. W. peak, 15** 9' W N. Long. W. peak 92<? 3' 40" W. 

 Lat. E. do. 15 4 50 N. E. 91 51 24 W. 



The bearings were determined astronomically, by mea- 

 suring the angular distance between the peaks and the 

 sun's limb, at sunrise. The altitudes were measured by 

 four sextants. 



