586 Note on the Map attached to [No. 102. 



My object in furnishing you with the sketch, was to rectify such 

 errors as I could within what I supposed to be our own territories ; 

 but as the position of the Choomphon river has now been brought 

 forward, the whole of that portion of the west coast of the Gulf of 

 Siam may be taken into consideration ; I will, therefore, at the risk of 

 tiring you, even enter somewhat fully on the subject. 



When I made the sketch I sent you, I followed Crawfurd as the 

 latest authority for that part of the coast of Siam, except so far as to 

 give the coast below Kivi Point a less curvature than it had in his 

 map, to accommodate it to the site of the coal fields. I have since 

 looked into Horsburgh's Chart, and find his delineation of that part 

 would have suited me better. I have also since met with certain 

 documents connected with that coast, and a sketch, which I shall 

 allude to below. 



I have now added to my original sketch the outline of the Siamese 

 coast as given by Crawfurd, Horsburgh, and the sketch mentioned 

 above, so that these being placed in juxta position with each other, you 

 will be able, at a coup d'ail, to see the differences of the authori- 

 ties, and draw your own conclusions. 



I am not acquainted with Horsburgh's authorities for his chart. Mr. 

 Crawfurd sailed in sight of Kivi, or Cin Point, so that we may con- 

 sider this point as satisfactorily fixed. The remainder of the coast 

 was delineated from information obtained from an intelligent native 

 Mahomedan of Siam, who was acquainted with the use of maps, 

 &c. and could even take an altitude of the sun. So that the value of 

 these two authorities must be left to the judgment of persons interested 

 in the matter. 



I must now revert to the sketch noticed above. During Colonel 

 Burney's Mission to Siam in 1826-27, he left at Sigor, Mr. Harris, 

 Acting Assistant Surgeon, and Mr. Leal, his interpreter, to accompany 

 the rajah of that place by land to Bangkok. Mr. Harris appears to 

 have kept a Journal, from which I have extracted largely, as the ac- 

 companying paper will show; and though the purpose I intended it for 

 has been nullified, yet as we are on the subject of that coast, I en- 

 close it. 



By the Journal it appears that the late Mr. Leal, who was, I believe, 

 a nautical man, fixed the latitude of many places by observation, and 



