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the main present land-units had the two above mentioned rivers at 
the extremities. 
Being not available an adequate number of datum points cal- 
culated for the photograms absolute orientation, no photogramme - 
tric instrument, such as Zeiss Stereotop of Stereocord could be 
utilized to measure the differences in height. Therefore, was 
used the parallax bar, which in such cases permits to obtain the 
best results. 
Calculated heights refer to the foliage top since it was not 
possible to find lands without vegetation. 
To find the real soil morphology, the average height of va- 
vegetation types, ascertained during the surveys made on the 
was deducted from the measurements effected. 
rious 
spot, 
Used photographs present an approximate scale equal to 
1:21000 and were taken with a camera having a focal length of 
152,22 mm. 
a) Description of the sections 
The first section A-A' has a length of about 8607 mt and 
presents high slopes; 48 surveys about the heights were made in 
this section and it was found that the point at the greater height 
has a 153 mt. difference in respect to Segah rivercourse. 
Starting from point A it is possible to observe that, except 
from a short strip of land characterized by a damp forest, an high 
-trunk vegetation prevails, whose single crown is very-well 
distinguishable in the air photographs; the morphology immediately 
becomes steep and the heights considerably vary. The two topogra- 
phic points placed at lowest heights are present near two tributa 
ries of Segah River, along which is also present a scantily high 
arboreal vegetation. About near the middle of the section the 
heights beginn to decrease almost regularly, till they reach a 
value of few meters above Kelai rivercourse; here the Primary 
Forest suddenly ends leaving the place to a lower and less wide 
vegetation (Secondary Forest); all this is probably due to the 
difficulties arising from the recurrent river overflows. Even the 
topographic surface tends to horizontality and slowly descends 
towards the watercourse. 
The second section B-B' has a length of about 8586 mt., 33 
surveys were carried out in this section, and it was found that 
the differences in height are lower than those of previous 
section. In fact, the height difference between the higher point 
and Segah river is equal to 89 mt. 
Starting from point B and for a short stretch, on a slightly 
sloping land there are agricultural grounds followed by the pre- 
viously described Primary Forest. The heights tend gradually to 
rise, till they keep at a value of about 80 mt.; in this stretch 
it was possible to measure the only height directly from the 
957