iSijs] 4 80 [Marbut. 
or vat least more so tlian the larger ones. The result will be that 
the larger streams will reach grade long before the smaller ones 
have, and even if they do not, their slope at grade will be so 
much smaller than that of the smaller streams that at a little 
distance inland from the coast their channels will be lower 
than those of the latter. This gives the subsequent branches 
growing headwax-d from the large streams inland from the out- 
crop of the hard member or members a great advantage over the 
similarly related branches of the smaller streams. A small sub- 
sequent branch of a large stream growing head ward along the 
strike of the soft beds, inland from the outcrop of the hard ones, 
may grow headward so rapidly, on account of its advantage of 
a low outlet through the hard rocks by way of the channel 
of the large stream, that it will finally reach back to a 
smaller originally consequent stream and, by offering a lower 
outlet to the sea, capture its head waters. 
This may occur on both sides of a master stream and may 
extend to all the originally consequent streams for a consider- 
able distance. 
The final result will be the formation of alternating l)elts of 
lowland and upland running along the strike of the rocks 
approximately parallel to the old coast Hne, drained transversely 
by a few large streams which have maintained their way through 
the hard rocks and have captured the head waters of most, or 
all, of the smaller consequent streams, causing them to flow 
along the lowland belts and seek an outlet through the gap in 
the upland made by the larger streams. 
The upland will fall more or less steeply as an escarpment or 
rather steep slope on the landward side to the adjacent inner 
lowland, and slope gradually on the seaward side, either into the 
adjoining lowland belt or to the coast. The lowlands will be 
al)ruptly terminated by the steep face of the upland on one side 
and more gradually by the gradual rise to the upland on the 
other. 
At maturity the features will be al^out as snown in Fig. 2. 
A is the master stream of the area. It has captured the head 
waters of the small consequent streams a, ^, and r, diverting 
them to an adjusted course along the inner lowland and taking 
