﻿Geology 
  and 
  Mineralogy. 
  429 
  

  

  present 
  edition 
  some 
  new 
  analytical 
  methods 
  have 
  been 
  added, 
  

   the 
  table 
  of 
  atomic 
  weights 
  has 
  been 
  revised 
  and 
  the 
  errors 
  

   noted 
  during 
  its 
  use 
  for 
  the 
  past 
  three 
  years 
  have 
  been 
  corrected. 
  

   12. 
  Die 
  Fortentioickelung 
  der 
  elektrischen 
  Eisenbahn-Einrich- 
  

   tungen, 
  von 
  L. 
  Kohlfurst. 
  Vienna, 
  189 
  (A. 
  Hartleben's 
  Ver- 
  

   lag). 
  — 
  This 
  volume 
  is 
  published 
  in 
  the 
  same 
  form 
  as 
  those 
  of 
  the 
  

   " 
  Elektro-technische 
  Bibliothek 
  " 
  repeatedly 
  noticed 
  in 
  this 
  

   Journal. 
  It 
  is 
  devoted 
  to 
  the 
  various 
  applications 
  of 
  electricity 
  

   to 
  railroad 
  traffic, 
  in 
  the 
  telegraph, 
  telephone, 
  signals, 
  etc., 
  and 
  

   " 
  gives 
  much 
  information 
  on 
  these 
  practical 
  subjects 
  compressed 
  

   into 
  a 
  small 
  space. 
  

  

  II 
  Geology 
  and 
  Mineralogy. 
  

  

  1. 
  Report 
  of 
  Exploration 
  of 
  the 
  Glacial 
  Lake 
  Agassiz 
  in 
  

   Manitoba; 
  by 
  Warren 
  Upham. 
  156 
  pages 
  8vo, 
  with 
  two 
  

   maps 
  and 
  a 
  plate 
  of 
  sections 
  ; 
  forming 
  Part 
  E, 
  Annual 
  report 
  of 
  

   the 
  Geological 
  and 
  Natural 
  History 
  Survey 
  of 
  Canada, 
  vol. 
  iv, 
  

   for 
  1888-89. 
  — 
  The 
  departure 
  of 
  the 
  ice-sheet 
  of 
  the 
  Glacial 
  

   period 
  is 
  shown 
  to 
  have 
  been 
  attended 
  with 
  the 
  formation 
  of 
  a 
  

   vast 
  lake 
  in 
  the 
  basin 
  of 
  the 
  Red 
  River 
  of 
  the 
  North 
  and 
  of 
  

   Lake 
  Winnipeg, 
  held 
  by 
  the 
  retreating 
  ice-barrier. 
  It 
  exceeded 
  

   in 
  extent 
  the 
  combined 
  areas 
  of 
  the 
  great 
  lakes 
  tributary 
  to 
  the 
  

   St. 
  Lawrence, 
  and 
  had 
  a 
  maximum 
  depth 
  of 
  about 
  600 
  feet. 
  

   Seventeen 
  shore-lines, 
  marked 
  by 
  beach-ridges 
  of 
  gravel 
  , 
  and 
  

   sand, 
  are 
  found 
  at 
  successive 
  levels 
  upon 
  the 
  northern 
  part 
  of 
  

   this 
  lacustrine 
  area 
  which 
  are 
  referable 
  to 
  stages 
  of 
  the 
  glacial 
  

   lake 
  while 
  it 
  outflowed 
  southward 
  by 
  way 
  of 
  Lakes 
  Traverse 
  and 
  

   Big 
  Stone 
  and 
  the 
  Minnesota 
  River. 
  At 
  lower 
  levels, 
  eleven 
  

   later 
  shore-lines 
  belong 
  to 
  stages 
  of 
  outflow 
  northward, 
  previous 
  

   to 
  the 
  recession 
  of 
  the 
  ice 
  from 
  the 
  region 
  crossed 
  by 
  the 
  Nelson 
  

   River, 
  whereby 
  Lake 
  Agassiz 
  was 
  reduced 
  to 
  Lake 
  Winnipeg. 
  

   The 
  earliest 
  and 
  highest 
  beaches 
  have 
  a 
  gradual 
  ascent 
  of 
  about 
  

   one 
  foot 
  to 
  the 
  mile 
  northward 
  along 
  an 
  explored 
  extent 
  of 
  400 
  

   miles 
  from 
  south 
  to 
  north 
  ; 
  but 
  in 
  the 
  lower 
  beaches 
  there 
  is 
  a 
  

   gradual 
  decrease 
  of 
  this 
  ascent, 
  and 
  the 
  latest 
  and 
  lowest 
  beaches 
  

   are 
  very 
  nearly 
  level. 
  It 
  is 
  thus 
  known 
  that 
  the 
  area 
  of 
  Lake 
  

   Agassiz 
  was 
  undergoing 
  a 
  differential 
  northward 
  uplift 
  during 
  

   the 
  time 
  of 
  the 
  ice-departure, 
  and 
  that 
  the 
  uplift 
  was 
  nearly 
  

   completed 
  within 
  that 
  time. 
  On 
  the 
  adjoining 
  country 
  of 
  Min- 
  

   nesota 
  and 
  North 
  Dakota 
  eleven 
  distinct 
  terminal 
  and 
  recessional 
  

   moraines 
  indicate 
  the 
  maximum 
  extension 
  of 
  this 
  ice-sheet 
  and 
  

   stages 
  of 
  halt 
  or 
  re-advance 
  interrupting 
  its 
  general 
  retreat 
  ; 
  and 
  

   five 
  of 
  these 
  moraines, 
  namely, 
  the 
  Dovre, 
  Fergus 
  Falls, 
  Leaf 
  

   Hills, 
  Itasca, 
  and 
  Mesabi 
  moraines, 
  were 
  accumulated 
  after 
  Lake 
  

   Agassiz 
  began 
  to 
  exist 
  in 
  the 
  Red 
  River 
  Valley. 
  

  

  An 
  appendix 
  of 
  this 
  report 
  gives 
  a 
  tabulation 
  of 
  glacial 
  striae 
  

   on 
  the 
  region 
  of 
  Lake 
  Agassiz 
  and 
  the 
  country 
  northward 
  to 
  

   Hudson 
  Bay 
  and 
  the 
  Mackenzie 
  ; 
  and 
  another 
  appendix 
  notes 
  

   altitudes 
  determined 
  by 
  the 
  Canadian 
  Pacific 
  railway 
  surveys 
  in 
  

   Manitoba 
  and 
  westward 
  to 
  the 
  Pacific. 
  

  

  