MODERN CHANGES 
105 
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 
b airweather Range, separating Glacier Bay from the Gulf 
