172 
YANG-TSE-KIANG. 
were often conjoined with masses of light grey mica, of nearly equal 
dimensions. 
The map which introduces this chapter will convey to the reader 
some idea of that part of the Yang-tse-kiang gone over by the Em- 
bassy, and of the extent and form of the Po-yang lake as laid down 
by the Missionaries. I have marked on it the height of the baro- 
meter, thermometer, and hygrometer, at noon every day during our 
passage, and the productions of the country as far as I could obtain 
accurate information respecting them. 
The barometer varied very little during our route from Qua- 
chow to Nan-chang-foo, but the hygrometer rose or fell with 
every change of the wind. The thermometer often fell below 50° 
of Fahrenheit. The prevailing wind was north-easterly, which 
depressed the hygrometer, whilst southerly winds raised it ; an 
effect contrary to what I had observed in the Yellow sea. This 
difference of result is obviously explained by the consideration, that 
in the Yellow sea the north-easterly wind was from the land, and 
therefore a dry wind, and on the Yang-tse-kiang, a sea wind, and 
therefore a moist wind, and vice versa with respect to the southerly 
winds. These circumstances are further conclusive of the delicacy 
of Leslie’s hygrometer as a meteorological instrument. For the 
details of the experiments, I refer my reader to the Appendix. 
