SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE SHERZER. 



PLATE XXXI. 



1. <> Position of plates, July 31 St., I 



Position ofp/atfs. Sept 5th., I89S 

 Average slope of surface at this point Zo' 



GLACI ER 



, 



evergreens, 3 

 average 29 years 



Alder bushes n '<?": 

 ' 









POSITIONS OK MARKED ROCRS. 



Large polished boulder on top of moraine, (Aug. '90.) 

 fi. Triangular blcck. (Vaux, 1898.) 

 C.~ Round boulder. (Vaux, 1898.) 

 A Double rock. (Vaux, 1898.) 

 E. Large rock in border moraine. (Vaux, 1887.) 

 /'"- Large angular block. (Not marked.) 

 ('. Pyramidal block. (Not marked.) 

 //. Tongue of ice. 

 /. Large bottom rock. (Not marked. I 



. Large bottom rock. (Not marked.) 

 A". Large botiom rock. (Not marked.) 



- Large bottom rock. (Not marked.) 



. Small rounded boulder. (C. O. E. 1895.) 



. Large bottom rock. (Not marked.) 



. Large boulder. (Not marked.) 

 -". Two boulders. (Oct. '95.) 



. Long flat boulder. (Ice 4 th Aug. end of snout, '19.) 

 *. Polished boulder of green quartzite. (Not marked.) 

 V. Long, flat boulder. (16 ft. from nearest ice, '90.) 



'- Rocks tarred by W. S. Green, Aug. 13, 1. 

 V. Egg-shaped boulder. (Striped with paint.) 

 / '. -Marked rock. 

 W. Large rock, point of view of test pictures. 



The points on border of ice marked by a star were determined trig- 

 onometrically. 





, 



V " 



Scale 

 100 200 300 400 500 feet 



Tongue and Moraines of the Illecillewaet Glacier, August, 1899. Published through the courtesy of George and William S. Vaux, Jr. 



Proceedings of the Philadelphia Academy of Natural Sciences, 1899. 



From the 



