Xvi INTRODUCTION. 



means which are necessary for the complete execu- 

 tion of the object above-mentioned, and for the 

 health and comfort of their Ships' Companies. You 

 are also furnished with all the information, we at 

 present possess, of the ports which you are to survey; 

 and nine Government Chronometers have been em- 

 barked in the Adventure, and three in the Beagle, 

 for the better determination of the Longitudes. 



" You are therefore hereby required and directed, 

 as soon as both vessels shall be in all respects ready, 

 to put to sea with them ; and on your way to your 

 ulterior destination, you are to make, or call at, the 

 following places, successively ; namely ; Madeira : 

 TenerifFe : the northern point of St. Antonio, and 

 the anchorage at St. Jago ; both in the Cape Verd 

 Islands : the Island of Trinidad, in the Southern 

 Atlantic : and Rio de Janeiro : for the purpose of 

 ascertaining the differences of the longitudes of 

 those several places. 



" At Rio de Janeiro, you will receive any supplies 

 you may require ; and make with the Commander- 

 in-chief, on that Station, such arrangements as may 

 tend to facilitate your receiving further supplies, in 

 the course of your Expedition. 



" After which, you are to proceed to the entrance 

 of the River Plata, to ascertain the longitudes of 

 the Cape Santa Maria, and Monte Video : you are 

 then to proceed to survey the Coasts, Islands, and 

 Straits ; from Cape St. Antonio, at the south side 



