﻿62 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Lakes 
  Algonquin 
  and 
  Iroquois 
  were 
  probably 
  contemporaneous, 
  

   and 
  it 
  is 
  believed 
  that 
  for 
  a 
  time 
  the 
  former 
  discharged 
  its 
  waters 
  

   to 
  the 
  latter 
  by 
  way 
  of 
  Balsam 
  lake 
  and 
  along 
  the 
  course 
  of 
  the 
  

   Trent 
  river. 
  This 
  discharge 
  by 
  way 
  of 
  the 
  Algonquin 
  river, 
  as 
  this 
  

   old 
  outlet 
  of 
  Lake 
  Algonquin 
  has 
  been 
  called, 
  robbed 
  the 
  Niagara 
  

   river 
  of 
  seven 
  eighths 
  of 
  its 
  water 
  supply, 
  which 
  up 
  to 
  then 
  had 
  

   reached 
  it 
  by 
  the 
  present 
  course 
  through 
  the 
  Detroit 
  river. 
  As 
  a 
  

   result, 
  the 
  volume 
  and 
  erosive 
  power 
  of 
  the 
  river 
  were 
  for 
  a 
  time 
  

   enormously 
  diminished. 
  (Fig. 
  II 
  and 
  13) 
  

  

  

  mmk 
  

  

  ^ 
  

  

  

  \_ 
  

  

  

  ^ 
  

  

  

  vi.,, 
  J-'-^iftie^ 
  

  

  ^^^^-— 
  -^'"■"■^^^^ife 
  

  

  

  

  A.-.. 
  

  

  ^^r";::r^^ 
  

  

  ^W 
  ^%^ 
  /--^ 
  

  

  ^'% 
  

  

  \ 
  /^^? 
  

  

  ^ 
  

  

  ^^^^£2^^^P 
  

  

  ^M 
  ^^^"-^^ 
  J^ 
  

  

  

  

  

  ^^w 
  

  

  ft 
  /T 
  

  

  

  <>>' 
  

  

  

  V 
  Y^^-^^ 
  / 
  

  

  

  

  

  /r-"-^ 
  \ 
  

  

  „.^^^^J; 
  ,J 
  

  

  /^^^ 
  ■'. 
  

  

  

  

  XJ 
  \ 
  \ 
  

  

  /'v^^^^^^^^^^^^^^^''^'^vi-C"-^. 
  '''\, 
  . 
  

  

  ,' 
  YyvMy/y/, 
  '^ 
  

  

  

  

  '. 
  } 
  

  

  

  

  

  

  

  JVta^yara. 
  ^^falls. 
  i 
  " 
  

  

  iv 
  

  

  

  

  4 
  x--- 
  

  

  

  \ 
  •--> 
  

  

  

  

  ^^-^ 
  ,-'-"' 
  / 
  

  

  

  . 
  ■»> 
  — 
  

  

  I 
  

   4 
  

  

  i 
  

   v 
  

  

  

  

  

  

  < 
  

  

  £^ 
  

  

  'Pit' 
  

  

  

  Fig. 
  12 
  Gilbert's 
  map 
  of 
  the 
  Great 
  lakes 
  at 
  the 
  time 
  of 
  the 
  Nipissing 
  outlet. 
  Modern 
  hydrography 
  

   dotted. 
  

  

  During 
  the 
  farther 
  retreat 
  of 
  the 
  ice 
  front, 
  a 
  still 
  lower 
  pass 
  was 
  

   opened 
  by 
  way 
  of 
  Lake 
  Nipissing 
  and 
  the 
  Mattawa 
  river 
  into 
  the 
  

   Ottawa. 
  By 
  the 
  time 
  this 
  outlet 
  was 
  opened, 
  the 
  ice 
  had 
  also 
  dis- 
  

   appeared 
  from 
  the 
  St 
  Lawrence 
  valley, 
  and 
  the 
  outlet 
  of 
  the 
  waters 
  

   of 
  the 
  great 
  lakes 
  was 
  transferred 
  from 
  the 
  Rome 
  channel 
  to 
  the 
  one 
  

   at 
  the 
  Thousand 
  islands, 
  Lake 
  Iroquois 
  at 
  the 
  same 
  time 
  subsiding 
  

   to 
  Lake 
  Ontario. 
  (Fig. 
  12 
  and 
  14) 
  

  

  The 
  successor 
  of 
  Lake 
  Algonquin, 
  after 
  the 
  change 
  from 
  the 
  

   Balsam 
  lake 
  to 
  the 
  Nipissing 
  lake 
  outlet, 
  has 
  been 
  named 
  by 
  Taylor, 
  

   Nipissing 
  great 
  lakes, 
  while 
  the 
  river 
  which 
  carried 
  its 
  discharge 
  to 
  

   the 
  Ottawa 
  was 
  called 
  by 
  him 
  the 
  Nipissing-Mattawa 
  (fig. 
  14). 
  

  

  