88 ALASKA GLACIERS 



pinnacles, two lines of medial moraines are distinctly 

 traceable, each partitioning off a fourth part of the ice 

 stream at the side. 



The Bryn Mawr, next south of the Smith, is somewhat 

 larger. Its two main branches, gathering in mountain val- 

 leys not well seen from the sea, become visible in twin 

 cascades, and then, uniting their streams, make a second 

 leap to the sea. As tide is reached, there is a tendency to 

 flatten the profile, and the central portion of the stream 

 becomes nearly or quite horizontal for a few hundred feet 

 before breaking off in the terminal cliff. 



Next in the series comes the Vassar, parallel to the 

 Smith and Bryn Mawr and exhibiting a similar series of 

 cascades, but of smaller size and less direct in its course. 

 It is cumbered, especially in its lower part, by rock debris, 

 and close inspection was necessary to determine the fact 

 that it was actually tidal. 



The Wellesley, last of the tidal series, flows with gentle 

 grade through a mountain trough joining the fiord at right 

 angles, and then cascades to the sea, into which it plunges 

 without notable modification of profile. Beyond it are 

 small glaciers occupying alcoves on the mountain front 

 but ending far above the water. 



The Bryn Mawr, Smith and Radcliffe are represented 

 in fig. 45, the Bryn Mawr alone in the frontispiece, and the 

 Wellesley in a plate at page 122 of volume i, from a pho- 

 tograph by Merriam (No. 121, U. S. Biological Survey 

 series). The Bryn Mawr was photographed at shorter 

 range by Curtis (No. 276 A), but the view has not been 

 reproduced. 



In the intervals between the tidal glaciers just described 

 there is no forest at the water's edge, and the photographs 

 reveal none at higher altitudes ; but a little farther south 

 the coast is forested, and the trees climb up a few hundred 

 feet on the moraine heaps under the hanging glaciers. 



