▁the ▁gla cier ▁there ▁are ▁not ▁many ▁trib ut aries ▁on ▁the ▁north western ▁side , ▁contrast ing ▁with ▁a ▁considerable ▁number ▁which ▁descend ▁on ▁the ▁sout he astern ▁side ▁from ▁the ▁snow fields ▁and ▁cir ques ▁about ▁M t . ▁Cast ner ▁and ▁other ▁mountains ▁between ▁College ▁F i ord ▁and ▁Un ak wik ▁In let . ▁ ▁App legate ' s ▁map ▁of ▁Y ale ▁Gla cier ▁in ▁ 1 8 8 7 ▁shows ▁it ▁termin ating ▁somewhere ▁between ▁College ▁Point ▁and ▁the ▁present ▁stand ; ▁but ▁since ▁he ▁did ▁not ▁approach ▁the ▁gla cier ▁near er ▁than ▁ 1 2 ▁miles , ▁about ▁the ▁same ▁as ▁V ancouver ▁did ▁in ▁ 1 7 9 4 , ▁it ▁is ▁impossible ▁to ▁draw ▁any ▁conclus ions ▁from ▁these ▁early ▁maps ▁concerning ▁the ▁behavior ▁of ▁Y ale ▁Gla cier ▁prior ▁to ▁ 1 8 9 8 . ▁From ▁a ▁photograph ▁taken ▁by ▁M enden hall ▁in ▁the ▁latter ▁part ▁of ▁April , ▁ 1 8 9 8 , ▁it ▁is ▁evident ▁that ▁the ▁rock ▁led ges ▁were ▁exposed ▁beneath ▁the ▁middle ▁of ▁the ▁ice ▁front ▁and ▁the ▁eastern ▁half ▁exhib ited ▁" the ▁rough ▁p inn ac led ▁front ▁of ▁a ▁still - ad van cing ▁stream . ▁Its ▁western ▁front ▁is ▁of ▁dead - white ▁ice ." ▁On ▁this ▁same ▁occasion , ▁Cast ner ▁went ▁on ▁snow sh o es ▁some ▁distance ▁up ▁the ▁margin ▁of ▁the ▁Y ale ▁Gla cier , ▁which ▁may ▁perhaps ▁show ▁that ▁it ▁was ▁then ▁less ▁sever