372 APPENDIX. 



Again, there is a difference of 5° between Thunberg's 

 Journal ; and the one furnished by the Memoirs of the 

 Batavian Society and that of Yon Siebold. 



Thus, it is obvious that these Journals must be considered 

 as imperfect records of the true temperature of the at- 

 mosphere. Those of Canton and Macao were nevertheless 

 kept with care, and are deserving of equal attention with 

 the ordinary Journals of this description not kept by 

 scientific observers. 



Elevation of the Tea Districts above the Sea Level. 



I have not attempted to estimate the height of the tea 

 country above the level of the sea, because we have too 

 little data upon which any such calculation can be grounded. 

 But, as observed by Dr. Boyle, as the barometer stands 

 at about 30° in the Yang-cse-kiang, it may be assumed 

 that the green tea district does not rise much above the 

 level of the sea. The same remark holds good as regards 

 the southern part of the province in which the tea districts 

 are situated ; for we see that as Lord Macartney's embassy 

 skirted this part of the province, the barometer stood at 

 about the same height. Further, Du Halde states, that at 

 Kieu-kiang-fu, situated on the south banks of the Yang- 

 cse-kiang, in Kiang-sy, the tide regularly ebbs and flows 

 at the full and change of the moon, although the distance 

 from the sea is computed to be 100 French leagues, or 

 280 British miles ; which circumstance equally marks 

 the low level of the entire province of Kiang-nan, as well 

 as the slow current of this great river beyond the ordinary 

 influence of the tide. 



With respect to the black tea district, calculating the 

 distance by the river Min at 270 miles from the sea, and 

 the current at even four miles the hour, which is a rapid 

 current, this might give (I am informed on very good 

 authority) an inclination of two and a half feet the mile ; 

 thus making the elevation of the Bohea district 675 feet 



