APPENDIX. 257 
one or the other Side of River??, on accounc 
of the Vapours which arife from them is fo 
very inconfiderable that it fecms to be mecr 
trifling to take any notice of it, nor fliould I 
have done it here, had not the contrary been 
a very prevailing Opinion, The principal 
Advantage. that the North Side of a River has 
above the South Side, feems to be this, viz. that 
it fliould be fomething warmer, on account 
of the Refledion of the Sun Beams from the 
Surface of the Water. 
Observation It 
I. TT was found in the fame XIX Expefi^ 
X rmnt^ VoL L on making an Eftimate of 
the Quantity of Dew and Rain which is ex- 
pended in Vegetation and Evaporation, that 
much the greateft part of what falls finks 
down into the Earth, and is fufficient in Quan- 
tity to account for the Origin of Fountains,’ 
without having Recourfe for Supplies, to the 
great Abyfs of Waters ; which is alfo further 
confirmed from the following Obfervations^ 
viz. Count Marfdli in his Htftoire de la Mere^ 
p. 15. obferves that Rivers from the neigh, 
boiiring Mountains of Lajjguedoc ix Pre^ 
S vmce^ 
