THERMO]METRICAL OBSERVATIONS. 287 



In order to determine the e.xaft pofitions of the flag ftaff in the ibrt at 

 Point Pefer, the iouth end of Cumberland Ifland, and the north end of 

 Amelia liland, the meridian was extended fouth from the obfer\'atory the 

 diftance of 99.12 perches. 



From the obfervatory the be.iring of the flag! 



ftjfF in the fort was J 



From do. to a fignal 011 the north end J 



cf Amelia Ifland J 



From do. to do. on the fouth end 1 



of Cumberland Ifland j 



From the fouth end of the bafe the bearing of) 

 the flag ftaff in the fort was J 



From do. to the fignal on the north endl 

 of Amelia Ifland j 



From do. to do. on the fouth end) 



of Cumberland Ifland J 



From thefe data by plain trigonometry the diftance "J 

 from the obfervatory to the flag ftaff in the fort > 

 comes out J 



From do. to tlie fignal on the north end of 7 



Amelia Ifland j 



From do. to do. on tlie fouth end of 7 



Cumberland Ifland J 



fc. 2 3 



S. 62 



S. 65 



0. 42 



S. 66 



S. 72 



51 



00 £. 



00 E. 



33 



30 



00 E. 



30 E. 



155-7 



1421.9^ 

 828.7J 



Perche 



Diff. cf laritude between th: obfervatory and flag ftaff 



■do. fignal on Amelia Ifland 



do. do. on Cumberland Ifland 



o o 

 o I 

 o o 



295 



45-7 

 56.0 



The latitude of the flag ftaff is therefore 



do. north end of Amelia Ifland 



do. fouth end of Cumberland 



30 



30 

 30 



43 

 42 



43 



40-37 

 24.1 J. 



I3-SJ 



Nortli. 



From which it appears that the jundion of the Chatahocha, or Apala- 

 chicola, and Flint Rivers, and the entrance between Cumberland, and 

 Amelia Iflands into the found, are precifely in the fame parallel of latitude. 



l"he angles were taicen with the inftrument already mentioned, made by 

 Mr George Adams. 



iSoo. 

 Feb. 6th. Afcended the St. Mary's as high as it was 

 navigable for canoes.* 



P p 2 ytli. 



* We afcended the river with as little loading and baggage as pofllbl-; 

 -I even left my hat and thermometer. 



