Lieutenant Wilcox's Survey of the NoHli-eaH of Assam, 6S 



ten you this before I left Dundee in September last, being 

 now on a voyage on board the ship City of Edinburgh for 

 New South Wales ; from thence you may expect to hear 

 from me. I leave this letter with the British Consul, who is 

 kind enough to forward it to you. 



A, Plate I. Fig. 2. is a glass tube of the form of a syphon; 

 the long leg is ground into the neck of the bottle I. B is a coni- 

 cal valve opening outwards. C a metallic wire fixed into the 

 moveable plug, on which the weights D, E, or more, may be 

 placed, so as to increase the weight of the valve, and thereby 

 restrain the escape of the gas when a greater pressure is required. 

 In the short leg of the syphon-shaped tube A is formed a valve 

 opening inwards. F is a bit of tube introduced tight into the 

 tube A, which is only intended to preserve the moveable part 

 of the valve in its proper position. G is another piece of tube 

 ground air-tight into the tube A, and a space about half an 

 inch is left between the tube F and G, so as to allow the disc 

 H to rise and fall. The inner end of the tube G, and the 

 under side of the disc H, are ground perfectly flat, so that 

 when they are in close contact the upper orifice of the tube 

 G is air-tight. The upper side of the disc, or the under end 

 of the tube F, may be natched. It will be seen from this 

 arrangement that the advantages mentioned in my letter will 

 be realized. I am. Sir, your most obedient servant, 



James King. 

 Laying at anclior off the Island of St Jago^ one 



of the Cape De Verdi's, ISth Nov. 1826. 

 To Dr Brewster. 



Art. XI. — Abstract of the Journal of the Proceedings of Lieu^ 

 tenant Wilcox, now engaged in a Survey of the North-east 

 of Assam. Communicated by a Correspondent in India. 



Lieutenant Wilcox proceeded ^up the Tenga Panee, till, 

 having passed the Mora, Tenga, Marbar, and Deesovee, he 

 found the stream reduced in breadth to eight or ten yards, 

 and the navigation stopped by numerous trees fallen in and 

 across it. Like all the rivers east of Suddeeya, it abounds in 

 rapids, and, from the great inclinatioi]i of its bed, the banks, 



