928 HERRY FIELDING RE ID 



would therefore respond more quickly than the larger glacier ; 

 this is confirmed by observation. We should also expect a 

 relatively greater change in size of its dissipator ; although, from 

 lack of data, I cannot say that this inference is borne out, still 

 we know that many small glaciers entirely disappear after a few 

 dry hot seasons, and reappear after a few cold wet ones. 



This theory offers a connecting link between the theories of 

 Professor Forel and Professor Richter.^ According to it a 

 glacier will respond to any climatic change, not by the progres- 

 sion of a wave along its surface, but by a change over the whole 

 surface ; but this change will not show itself by reversing the 

 phase (the condition of advance or retreat) of the glacier until 

 it has sufficiently accumulated to carry the surface up to and 

 beyond its equilibrium form. 



Harry Fielding Reid. 



'See this Journal III, 278-288. 



