THERMOMETRICAL OBSERVATIONS. 275 



Latitude by yS Andromeds . 30 41 56.6 



do. . a Lyrse . 30 41 39.4 



do. . /8 Pegafi , 30 4 1 52.1 



do. . aAndromedx . 30 41 57.3 



Mean Latitude North . 30 41 51.3 



From the refult of the foregoing obfervations, the latitude of our obfer- 

 Tatory by the large feftor, comes out 30"^ 42' 2". 2 N. and by the fmall 

 one 30° 41' 51". 3 N. By proceeding as in the former cafes where both 

 feftors were ufed, and tlie due weight given each, the latitude appears to be 

 30° 42' o".4, which we took for the true latitude of the obfervatory. 



The ground about the mouth of Flint river not being fit for encamping 

 on, in confequence thereof, we pitched on the nearcft commanding emi- 

 nence, from which with the leaft labour in falling the timber, the jundion 

 of the rivers might be difcovered : In order to conneft our work with the 

 junftion of the rivers, the following method was purfued. From the ob- 

 fervatory A (fee Fig. G, Plate XI.) a villa was opened to give us a view of 

 the point of land B, between the rivers. The angle which the line AB made 

 with the meridian AN, we had to determine by meafurement, the aftronomi- 

 cal circle which was admirably calculated for that purpofe, was fent away a 

 few days before (we were compelled by the Indians to leave the country) 

 on account of its weight, as 1 was informed by the commiflioner for His 

 Catholic Majefty ! To find the value of this angle, the triangle ANC was 

 formed on the ground. — AN a portion of the meridian was equal to 

 396.125 feet, AC, a portion of the line in the direftion of the junftion of 

 the rivers was equal to 496.623 feet, and NC the fide oppofite to the re- 

 quired angle, was equal to 336.583 feet* — the fides being given, the 

 angle CAN comes out to the neareft fecond 45° io' 19'' weft of north. 

 The diftance from A to B was found by meafurement to be 369 perches, 

 from which by the folution of a plane right-angled triangle, the difference 

 of latitude will be found to be 260.14 perches, or about 42 ".4, which add- 

 ed to the latitude of the obfervatory wiU give 30° 42' 42". 8 for die lati- 

 tude of the junftion of the rivers. — The fides of the triangle, with the 

 points of interfedlion were formed with the utmoll accuracy by the tranfit 

 inftrument. 



On the I 7th day of September, at the time we were 

 preparing to extend the Une from the mouth of Flint 

 river to the fource of the St. Mary's, tlie hoftile difpo- 



fition 



• The three decimal places annexed to the feet arofe from taking the 

 means of many meafurements made on each line. 



