566 



the ground rises rapidly towards Hind-head, where an elevation of 

 upwards of 900 feet above the level of the sea is attained ; the ascent 

 consisting of sand deeply trenched into channels. Here is a remark- 

 able depression, called the DevWs Punchbowl; and on Frensham 

 Common there is a conspicuous group of barren, somewhat conical 

 hills, called the DeviVs Jumps. The scenery in this neighbourhood 

 is wild, and the soil barren in the extreme ; the surface is, in fact, to 

 this hour, nearly such as it may be conceived to have been when first 

 uncovered by the departure of the sea. The whole division is inter- 

 sected with dehghtful valleys. 



There are some extensive ponds in this division, the principal one 

 being Frensham Great Pond, which occupies about 150 acres. The 

 whole district is drained by the various tributaries to the river Wey. 



J, D. Salmon. 



Observations on the Teas of Commerce. 

 By R. Warington, Esq., F.C.S.* 



In my previous communication to the Society on this subject, in 

 February, 1844,t I endeavoured to show that there exist two distinct 

 kinds of green tea, known in commerce as glazed and unglazed ; that 

 the former is coloured by the Chinese with a mixture of Prussian 

 blue and gypsum, to which a yellow vegetable colouring matter is 

 sometimes added, while the latter are merely dusted with a small 

 quantity of gypsum ; that in the specimen of the so-called Canton 

 gunpowder, this glazing or facing is carried to the maximum. I also 

 mentioned, that I had never met with a sample of green tea in which 

 the blue tint was given by means of indigo. Since the publication of 

 that paper, I have been in communication with several parties of great 

 experience in this subject, from whom I have received much addi- 

 tional information, which, with several exjjerimental points of interest 

 that have come under my own immediate observation, will form the 

 subject of the present paper. 



The first point to which I wish to call the attention of the Society 

 is, the question of the blue colouring matter used by the Chinese for 



* Read at the Chemical Society, May 19, 1851, and printed in their Quarterly 

 Journal, vol. iv. p. 156. 



■\ ' Memoirs and Proceedings of the Chemical Society,' ii. 73 ; (Read February 5, 



1844). 



