JAGGAR: EROSION AND SEDIMENTATION. 299 
experiments hitherto described in this paper show results which are 
still far too complex, but they point the way. 
STREAM-ROBBERY BMoper. The last experiment, the results of 
which are shown in ¡Plate 6, produced an interesting illustration of 
stream robbery. ‘The size, material, and method of this model were 
like those of the next preceding (Plate 5), the thickness slightly 
greater. The cracks shown in the photograph were the result of 
drying and should be disregarded in the discussion. Just as in the 
model of Plate 5, the drainage which developed left a clear zone of 
accumulation above, lateral streams 
formed on the two sides, and long 
straight slopeward streams formed 
medially. The ultimate stream pat- 
tern is shown in Fig. 3. 
At the end of the first day’s spray- 
ing the right side streams were about 
like the left ones shown between R 
and the left edge of the model. ‘That 
portion of stream E above the letter 
E was the headward portion of stream C 
C. There were thus three principal E 
medial streams initially. «There was ve 
an initial difference of baselevel as- 
Sumed whereby stream R fell off 
abruptly at its mouth F, whereas M, Fig. 5. Enlarged sketch of 
. stream E at moment of 
B, and C flowed out onto a flat plain capture 11.45 A. M. 
P. Asa result R became entrenched 
after the same fashion as the side streams. M, B, and C were depos- 
iting their loads and forming floodplains from about the zone of the 
letter M downwards. The right side stream E, having an abrupt 
fall-off at the edge of the plate, became entrenched and so possessed 
a greater fall than the sluggish and relatively overloaded €. Con- 
Sequently E undermined its way headward rapidly. 
On the second morning of the experiment (the spray was turned on 
for three or four hours each day) E, pushing headward, captured C. 
Fig. 4 shows a rough sketch of the model at 10.50 A. M., and Fig. 5 
shows the effect at the instant of capture. The captured district of C 
at once revived and entrenched itself and the swollen stream E ate its 
Way across the old floodplain of C. The lower part of C became quite 
inactive, being effectually shadowed by its captor. The latter (E), 
