xv 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: youare 
then to proceed to survey the Coasts, Islands, and 
Straits ; from Cape St. Antonio, at the south side 
