AND CHUSAN. 35 



on the extensive alluvial plain of that district for 

 ten clays together, and more than a foot deep. It 

 rains all the year, as at Canton, but the principal 

 rains set in in April and May. 



The difference between the temperature of the 

 harbour of Chusan and that of Shanghai is con- 

 siderable: but registers kept on board ship seem 

 generally to exhibit a higher temperature than 

 those kept on shore. Commodore Chad's register 

 kept at that port exhibits the following tempera- 

 tures. 



Spring, 64° 2'; Summer, 77° 6'; Autumn, 69° 5'; Winter, 53° 3'. 



Mean, 66° 2'. 



The hottest month, viz. August, 81° 5'. "I Mean, 



The two coldest months, Jan. and Feb. 51°. J 66° 2'. 



It may also be seen in the Appendix that a re- 

 markable agreement exists between the tempera- 

 ture of Shanghai and the port of Xangasacki in 

 Japan. 



It is correctly stated by Capt. Loch, R.N.*, an 

 intelligent and accurate observer, that every change 

 of wind from the regular monsoon occasions a 

 considerable depression or elevation of temperature ; 

 that is, when the wind shifts to opposite points 

 as here alluded to. The great changes of tempera- 

 ture described by Capt. Loch are not experienced 

 in the south during the S.W. monsoon. 



If we examine the variation of the highest and 



* Campaign in China. 

 d 2 



