96 National Geographic Magazime. 
ing subsequent branch recedes from the original master: and at 
last, equilibrium may be gained when the headwater slope of the 
diverting branch is no greater than that of the opposing subse- 
quent branch of the next uncaptured transverse stream. After 
the capture of a transverse stream has been effected in this way, 
the divide, Y, between its diverted upper portions, H, fig. 6, and 
its beheaded lower portion, C, will be pushed down stream by the 
growth of an inverted stream, V. This goes on until equilibrium 
is attained and further shifting is prevented on reaching the hard 
transverse lava sheets, Z, fig. 7; here the divide is maturely 
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established. In the case of a system of transverse streams, C, D, 
etc., fig. 7, successively captured by the subsequent branch of a 
single master, the divides (Z, Y’), between the inverted (V, V’) 
