i;o TRAVELS IN 
The Houzouana, more expert, employs only 
his fight. He throws himlelf flat on the 
ground;^ takes a diftant view, and, if the fpace 
which he traverfes with his eye conceals any 
fubterranean fpring, he rifes and points with 
his finger to the fpot where it is to be found. 
The only thing by which he difcovers it is 
that ethereal and fubtile exhalation which eva- 
porates from every current of water, when not 
funk to too great a depth. 
With regard to pools and other colledions 
formed by the rain, as their evaporation is 
more fenfible, they are difcovefable even w^hen 
hid by an eminence or a hill ; and the vapour 
of ftreams, fuch as rivers or rivulets, being fl:ill 
more abundant, is fo diftindly marked by it, 
that their courfe and even all their finuofities 
may be traced. 
I endeavoured to learn this art of the Hou- 
zouanas, during the time I refided amongft 
them. I followed their example, and pradlifed 
their lefibns ; and was at length able to make 
fimilar difcoveries, and with as much certaintv. 
My talent, however, was far from being fo ex- 
' tenfive as theirs ; forj owing either to the na- 
tural weaknefs of my fight or the want of ex- 
- perience^ 
