Vol. IV, pp. 19-84, PLS. 1-16 March 21, 1892 



THE ' 



NATIONAL GEOGRAPHIC MAGAZINE 



STUDIES OF MUIR GLACIER, ALASKA. 

 BY HARRY FIELDING REID. 



{Accepted for jjithJ leaf ion December 11, 1891.) 



CONTENTS. 



Page." 



Introduction and Narrative 20 



General Geograpliy 2o 



Glacier Bay and Muir Inlet ■ 25 



Muir Glacier 2() 



General Features 2(5 



Tributaries 28 



Surface of the Glacier '^0 



Crevasses 30 



Melting and Drainage 31 



Moraines and Debris Cones 32 



Former Extension and recent Diminution of the Glacier 34 



Extent and Date of the last great Advance 37 



Evidence that the last Advance was of short Duration 38 



A possible Cause of the recent Retreat 40 



Changes to be Expected 41 



Motion of the Ice 43 



Conditions holding at the Ends of Glaciers 45 



Alpine Glaciers 45 



Tidewater Glaciers : 47 



Glacial Erosion 50 



Meteorological Notes 52 



The Survey • . 53 



Supplement I — Notes on the Geology of the Mcinity of Muir 



Glacier ; by H. P. Gushing 50 



Supplement II — Notes on some Eruptive Rocks from Alaska ; by 



George H. Williams, Ph. D fi3 



4— N.\T. Geoc). MA(i., VOL, TV, 1S92. (19) 



