MODERN CHANGES 



IO S 



and Columbia histories agree in a present condition of 

 maximum glaciation probably preceded by an important 

 minimum. 



As glaciers grouped together (about Glacier Bay, Dis- 

 enchantment Bay, etc.) have seemed to vary in harmony, 

 it is natural to look for a systematic geographic arrange- 

 ment of the diverse histories; but such arrangement is not 

 apparent. Port Wells and the Grewingk Glacier, inter- 

 mediate in type of variation, are the most westerly of the 

 localities (see map, fig. 55). Between Glacier Bay and 

 Disenchant- 

 ment Bay, rep- 

 resenting one 

 extreme of 

 variation, flow 

 La Perouse 

 Glacier and its 

 neighbors rep- 

 resenting the 

 opposite ex- 

 treme. La 

 Perouse and 

 Columbia gla- 

 ciers, agreeing 



in phenomena FIG - 55- DISTRIBUTION OF GLACIER LOCALITIES. 



of variation, are separated by the contrasted phenomena 

 of Disenchantment Bay. 



Glacier Bay adjoins Lynn Canal, being separated only 

 by a mountain range, and some of the high neve fields of 

 this range feed glaciers of both slopes. On both sides the 

 glaciers are believed to be retreating, but the front of the 

 Davidson of Lynn Canal is less than half a mile from the 

 forest on its old moraine, and the Muir of Glacier Bay is 

 nearly twenty miles from the equivalent forest. The great 

 Fairweather Range, separating Glacier Bay from the Gulf 



