324 PLATEAU OF CAXAMAECA. 



the transit of Mercury gives the longitude of Lima 5h. 17m. 

 51s. (79 27' 45" W. from Paris, or 77 06' 03" W. from 

 Greenwich). Compare my Eecueil ^observations astron. 

 Vol. ii. p. 397, 419 and 428, with my Eelat. hist. T. iii. p. 

 592. 



Potsdam, June 1849. 



