k 



[ 251 ] 



the waters to the height I have ftated, is proved by the ob- 

 fervations of all thofe who have vifited thofe countries. Pallas 

 informs us that the immenfc defert of Cobea or Chamo forms 

 a flat platform whofe elevation can be compared only to that 

 of Quito in Peru (which Bouguer has fhewn to amount to 

 upwards of 9000 feet) and that the plains of the Monguls all 

 along to the Chinefe wall are nearly of the fame height *. 



Major Rennel, in his account of the map of India, tells us 

 that the country of Thibet is one of the higheft in Afia, being 

 part of that elevated trad which gives rife not only to the 

 rivers of India and China, but to thofe of Siberia and Tartary. 

 The Southern ridge of the mountains of Boutan (Thibet) rifes, 

 he fays, about a mile and a half above the plains of Bengal, 

 and may be feen in a horizontal diftance of one hundred and 

 fifty miles, p. 93 and 94, which indicates a height of fifteen 

 thoufand feet, or allowing for refradion according to Dr. Mafke- 

 lyne's rule, eleven thoufand nine hundred and eighty-one feet. 



According to Abbe Man's calculations, of all others the mofi: 

 accurate and the mod moderate, the height of the Ganges and 

 Hohanho, even at one thoufand miles diftance from the fea, 

 muft be three thoufand fix hundred and thirty feet. But Ma- 

 jor Rennel has fhewn in the Philofophical Tranfadions, 1781^ 



I i 2 p. 90,- 



* !■ Afl. Petrop. 1777, p- 38. 



