'34 II. F. Beid — Studies of 3Iwir Glacier. 



iee-front and then scatters over the projecting wing. At first 

 sight the nnnatak seems to furnish the material of this moraine, 

 l3Ut closer observation shows that this is not so. Mr Cnshing 

 called my attention to the fact that although the material of this 

 moraine is largely dark igneous rock, the nunatak is a light 

 granitoid rock ; and, moreover, the debris on the nunatak is 

 almost entirely of the same rock as the nunatak itself. Two 

 moraines issuing from the east side of the first northern tributar}^ 

 come to an end about half way between Snow dome and H (an 

 exi^lanation of these moraines appears on page 36. The remain- 

 ing moraines are like those with Avhich Ave are familiar on other 

 glaciers, and call for no special mention. Some must be over 20 

 miles in length. Their origins are lost in the snoAvs of the higher 

 parts of the glacier. Sand cones and glacier tables also occur 

 AAdiere the conditions are suitable. 



The moraines from / end in a long sharp ridge, the ice of 

 which is hidden by only a thin covering of stones of small size. 

 There are tAvo other similar ridges betAveen this one and the side 

 of the glacier, AAdiich, hoAvever, are not connected Avith moraines. 

 All the large-sized debris seems to have slid off" the steep side 

 and left only the smaller fragments. South of the eastern end of 

 nunatak G we fop.nd tAvo very curious cones of rolled stones. 

 The stones Avere about the size of billiard balls and rested on the 

 ice underneath just at the angle of repose, so that the slightest 

 disturbance, such as a little melting of the supporting ice, Avould 

 cause some to roll doAvn. Their edges Avere rounded, and they 

 presented exactly the appearance of having been knocked about 

 by running water. Their uniform size shoAVS that some agent 

 has been at Avork rejecting both smaller and larger pieces. Per- 

 haps they were collected by a stream at some point on the side 

 of G and an avalanche carried them out upon the ice. Other 

 cones occur near these, but are not composed of similar material. 



Former Extension and recent Diminution of the Glacier. 



Professor Wright has pointed out the facts Avhich shoAV that 

 Muir glacier has been both much larger and much smaller 

 than it is at present. The existence of erratics, rounded knobs, 

 and glacial scratches at points considerably above the present 

 level of the ice shows the first ; the existence of the buried forest 

 on the western side of Muir inlet and of old logs on some of the 

 moraines shoAV the latter. He has also collected the folloAving 



