Figure 73 — The seaward edge of an outlet glacier. Calving has produced many 

 bergy bits and growlers. Lines of weakness are shown at the lower right. 



Figure 74 — Barnard Glacier, Alaska, showing relation of lateral and medial moraines 

 to tributary glaciers. The high peak is Mt. Natazhat (13,480 feet), 25 miles away 

 on the Alaska- Yukon boundary. ( Bradford Washburn. ) 



67 



