xii ILLUSTRATIONS 



FIGURE 



92. East wall of Plover Bay, Siberia 190 



93. Hanging valley, Plover Bay 191 



94. Downward limit of crevasses in Muir Glacier 198 



95. Crevasses and seracs, Muir Glacier 199 



96. Pinnacles on Columbia Glacier 200 



97. Back of Columbia Glacier 200 



98. Level tract on Muir Glacier 201 



99. Ideal profile and section of a glacier 201 



100. Ideal section of water-filled crevasses 202 



i o i . Influence of drift on surface character of glacier 202 



102. Ice sculpture in Russell Fiord 209 



103. Diagrams illustrating flotation theory of tidal glaciers 210 



104. Diagrams illustrating non-flotation theory of tidal glaciers... 211 



105. Contact phenomena of glass and mercury 212 



106. Ideal section of tidal glacier 215 



