﻿524 
  Proceedmgs. 
  

  

  swallow, 
  he 
  doubted 
  very 
  mucli 
  whether, 
  if 
  brought 
  here, 
  it 
  could 
  be 
  induced 
  to 
  remain 
  

   with 
  us, 
  the 
  migratory 
  instinct 
  being 
  very 
  powerful. 
  

  

  9. 
  Dr. 
  Hector 
  exliibiled 
  a 
  telephone 
  and 
  two 
  forms 
  of 
  the 
  microphone, 
  made 
  by 
  Mr. 
  

   John 
  Kebbell, 
  and 
  explained 
  the 
  principles 
  of 
  their 
  construction. 
  The 
  microphones 
  were 
  

   placed 
  on 
  the 
  lecture 
  table, 
  and 
  connected 
  by 
  wire 
  laid 
  to 
  different 
  parts 
  of 
  the 
  Museum 
  

   with 
  several 
  telephones 
  in 
  circuit 
  ; 
  the 
  marvellous 
  transmission 
  of 
  faint 
  sounds 
  was 
  readily 
  

   illustrated. 
  The 
  experiments 
  j^erformed 
  were 
  to 
  some 
  extent 
  marred 
  by 
  the 
  extreme 
  sensi- 
  

   tiveness 
  of 
  the 
  instruments, 
  as 
  the 
  irregular 
  noises 
  produced 
  by 
  the 
  rustling 
  movements 
  

   of 
  the 
  audience 
  frequently 
  overpowered 
  the 
  sounds 
  that 
  were 
  intended 
  to 
  be 
  transmitted. 
  

   The 
  sounds 
  of 
  the 
  voice, 
  of 
  tuning 
  forks, 
  and 
  slight 
  friction 
  of 
  the 
  sounding 
  boards 
  of 
  the 
  

   microphones 
  were, 
  however, 
  rendered 
  distinctly 
  audible 
  throughout 
  the 
  complete 
  circuit. 
  

  

  A 
  cordial 
  vote 
  of 
  thanks 
  was 
  passed 
  to 
  Mr. 
  Kebbell 
  for 
  his 
  kindness 
  in 
  exhibiting 
  to 
  

   the 
  Society 
  these 
  interesting 
  inventions. 
  

  

  FouKTH 
  Meeting. 
  Slst 
  August, 
  1878. 
  

   T. 
  Kirk, 
  F.L.S., 
  President, 
  in 
  the 
  chair. 
  

   New 
  Members. 
  — 
  G. 
  Morton, 
  J. 
  E. 
  W. 
  Cook, 
  WiUiam 
  Berry. 
  

   Additions 
  to 
  the 
  library 
  were 
  laid 
  on 
  the 
  table, 
  and 
  Dr. 
  Hector 
  drew 
  attention 
  to 
  the 
  

   folloAving 
  fishes 
  lately 
  added 
  to 
  the 
  Museum 
  collection, 
  viz., 
  Holocanthus 
  arcuatus, 
  Mono- 
  

   cantlms 
  hi2:)pocrepis, 
  and 
  Serranus 
  trutta 
  (the 
  latter 
  being 
  a 
  new 
  species) 
  from 
  Fiji, 
  

   collected 
  and 
  presented 
  by 
  Lord 
  Hervey 
  Phipps 
  ; 
  also, 
  Ceratodus 
  forsteri, 
  from 
  Queens- 
  

   land, 
  presented 
  by 
  Sir 
  C. 
  Wyville 
  Thompson. 
  

  

  1. 
  "On 
  some 
  of 
  the 
  Causes 
  which 
  operate 
  in 
  Shingle-bearing 
  Eivers 
  in 
  

   the 
  Determination 
  of 
  their 
  Courses 
  and 
  in 
  the 
  Formation 
  of 
  Plains," 
  by 
  

   J. 
  P. 
  Maxwell,A.I.C.E. 
  

  

  ABSTEACT. 
  

  

  The 
  author 
  contended 
  that 
  the 
  Canterbury 
  Plains 
  were 
  formed 
  by 
  the 
  

   action 
  of 
  the 
  rivers 
  in 
  conveying 
  shingle 
  from 
  the 
  ranges 
  and 
  depositing 
  it 
  

   in 
  their 
  lower 
  courses 
  and 
  at 
  their 
  mouths 
  ; 
  that 
  continual 
  changes 
  in 
  the 
  

   courses 
  of 
  the 
  streams 
  were 
  effected 
  by 
  these 
  deposits, 
  thus 
  giving 
  rise 
  to 
  

   the 
  distribution 
  of 
  material 
  over 
  extended 
  areas 
  ; 
  that 
  this 
  process 
  was 
  still 
  

   going 
  on, 
  and 
  that 
  the 
  elevation 
  and 
  extension 
  of 
  the 
  plains 
  would 
  pro- 
  

   ceed 
  while 
  the 
  supply 
  of 
  detritus 
  from 
  the 
  ranges 
  continued 
  ; 
  that 
  the 
  features 
  

   were 
  largely 
  modified 
  by 
  the 
  action 
  of 
  the 
  sea 
  in 
  distributing 
  the 
  shingle 
  

   along 
  the 
  coast-line 
  ; 
  that 
  examination 
  of 
  the 
  river 
  beds 
  showed 
  that 
  they 
  

   are 
  sometimes 
  elevated 
  along 
  the 
  middle 
  lines 
  of 
  their 
  length, 
  and 
  that 
  

   streams 
  flowed 
  on 
  either 
  side, 
  cutting 
  notch-like 
  channels 
  in 
  the 
  older 
  plain 
  

   formation 
  ; 
  that 
  the 
  evidence 
  of 
  these 
  channels 
  on 
  both 
  sides 
  of 
  the 
  river 
  

   beds 
  is 
  a 
  suf&cient 
  refutation 
  of 
  the 
  theory 
  of 
  the 
  supposed 
  effect 
  of 
  the 
  

   influence 
  of 
  the 
  earth's 
  rotation 
  in 
  causing 
  erosion 
  on 
  one 
  side 
  onl3^ 
  

  

  Dr. 
  Hector 
  said 
  he 
  agreed 
  with 
  the 
  views 
  of 
  the 
  author 
  as 
  far 
  as 
  they 
  went, 
  but 
  he 
  

   thought 
  that 
  the 
  formation 
  of 
  the 
  great 
  fan-lilre 
  deposits 
  of 
  shingle 
  that 
  go 
  to 
  make 
  up 
  

  

  