FROM TONKIN TO INDIA 



3. Tali-Fou 



Latitude = 25° 42' 30" N. Astronomical observations. 



Longitude = 98' 3' 45" E. This longitude is the mean of the three following: — 



(i) That given by my estimated distance, taking Ssumao as point of 

 departure : 98° 4' 30". 



(2) That given by my astronomical observations : 97° 59'. 



(3) That given by Francis (iarnier's observations: 97° 8'. 



4. Atentsk 



(No astronomical observations owing to theft of instruments.) 

 Latitude = 28° 28' N. This latitude is the mean between — 

 (i) My estimated latitude: 28° 29'. 

 (2) Latitude on Gill's map corrected: 28^ 27'. 

 In his map Captain Clill makes 28° 23' the latitude of Atentse. But as he did not 

 take astronomical ob.servations, I am of opinion that this should be altered 4', for the 

 following considerations : He places Batang on his map at latitude 29° 53' 50", 

 whereas its real latitude, observed with the sextant by P'ather Desgodins, is 30' 00' ; 

 his latitude of Tali, on the other hand, is identical with that given by ( larnier and 

 verified by myself. There is thus an error of 6' 10" on the Batang-Tali length, and 

 by interpolation (Batang, Atentse, and Tali being practically on the same line) an 

 error of 4' on the Atentse-Tali length ; the real latitude of Gill ought therefore to be 

 considered as 4' more N., which gives 28' 27'. That adopted by CJeneral Walker in 

 his map of Thibet is 28' 30'. 



Longitude = 97° 00' E., being the mean between — 



(i) My longitude estimated starting from position adopted for Tali : 97° 00'. 

 (2) The longitude adopted by General \Valker in his map of Thibet 

 (July 1894): 97^ 00'. 

 A\'hich, as is seen, happen exactly to coincide. 



5. Kii.A.MTi (Padao, capital of the country) 



Latitude = 27' 22' 30" N. Observed by Colonel Woodthorpe. (My own latitude, 

 estimated after two months and a half without any guiding marks, was 27° 28' 30", or 

 only 6' difference. The most recent maps of Assam place Khamti in 27° 24' N. 

 latitude. But I have thought it better to maintain that of Col. Woodthorpe.) 



Longitude = 97' 30' 45" E. of (ireenwich, or 97° 31' (95° 11' E. of Paris). I have 

 adopted this figure from the following considerations : — 



Between Khamti and Daphagang (point of arrival on my map, close to the con- 

 fluence of the Dihing and the Dapha, which appears in the geodesic survey of the 

 positions in Assam) the distance estimated by Col. Woodthorpe is . . 55' 35" 



According to my own estimation this same distance should be . . .1° 00' 35" 



Mean . 58' 05" 



By carrying this mean difference to the east of Daphagang (96" 32' 40") I obtain 

 97° 30' 45", the longitude adopted. 



(On arrival at Khamti after two and a half months' march, my estimated longitude 

 was 97° 33' 15" E. of Greenwich, while that of Col. Woodthorpe, starting from Assam, 

 was 97° 28' 15"; or only 5' difference at the point of coincidence on a total route of 

 3° 30' in longitude.) 



6. D.\PH.\GANG (point of arrival) 



Latitude =27° 29' 10" N. 



Longitude = 96' 32' 40" E. (Greenwich). Following Col. Woodthorpe and the 

 maps of Assam. 



