376 Geographical Notices. 
In its geological features the dividing ridge bears some anal- 
ogy to the structure of the table-land. A similar trappean rock 
of a schistose texture, perhaps less compact, underlies a deep 
quaternary bed. Between both, traces of tertiary layers may be 
discovered by parties better fitted out for exploring purposes 
than we were. 
In the bed of small streams on both sides, an argillaceous 
On the latter place, rocks in situ were seen nearly related to thos 
on the Truandé falls. : real 
The prevalence of terrestrial plants against aereal and arbo: 
forms observed through the lower portion of the Atlantic slope 
may justify the idea of supposing the crest of this dividing 
ridge to be likewise a water-shed and a meteorological di 
between both oceans. , we at 
This section, though not uninhabitable, is not populai ot Ii 
all; it looks more like a neutral ground between the qu 
dians and the adventurous Zambos on the other side. wil 
The distance travelled across this section is about 75 mu 
Section VILL. The Alluvivm.—This section forms a nant 
belt linking together the western slope of the dividing ridge of at 
the tide-water flats below. There seems to be an increase agai 
mospheric humidity, which produces vegetable ners hefre 
The generic and numeric animal and vegetable forms Tittle eX 
at Teg ; served throug 
tent to sustain again that opulence which was 0 It is true 
population of te 
seaside near by. rozas for 
. . ed i 
This section also contains a number of clearing { h x 
Section IX. The Mangroves.—This section 16 a 
almost exclusively rhizophorous, much more so divi qual growth 
lent on the Atlantic side. In regard to the im 
