﻿C. 
  K. 
  Wearl 
  — 
  Intensity 
  of 
  Sound. 
  21 
  

  

  dissolved 
  readily 
  in 
  cold 
  dilute 
  hydrochloric 
  acid 
  in 
  all 
  cases 
  

   except 
  that 
  of 
  rectorite. 
  In 
  order 
  to 
  dissolve 
  the 
  residue 
  from 
  

   the 
  latter 
  it 
  was 
  necessary 
  to 
  use 
  much 
  stronger 
  acid 
  and 
  even 
  

   then 
  the 
  solution 
  was 
  not 
  complete. 
  The 
  composition 
  of 
  this 
  

   residue 
  has 
  not 
  yet 
  been 
  determined. 
  

  

  From 
  the 
  foregoing 
  facts 
  and 
  considerations, 
  it 
  is 
  probable 
  

   that 
  three 
  members 
  out 
  of 
  the 
  possible 
  four, 
  making 
  up 
  the 
  

   above 
  described 
  series, 
  are 
  known, 
  and 
  the 
  present 
  status 
  of 
  

   the 
  Kaolinite 
  Series 
  may 
  therefore 
  be 
  concisely 
  stated 
  as 
  

   follows 
  : 
  

  

  Kaolinite 
  Series 
  

  

  1. 
  Rectorite 
  Al 
  2 
  3 
  2Si0 
  2 
  H 
  2 
  + 
  aq. 
  Monoclone 
  (?). 
  

  

  2. 
  Kaolinite 
  and 
  members 
  Al 
  2 
  3 
  2Si0 
  2 
  2H 
  2 
  Monoclinic 
  or 
  0. 
  

   of 
  the 
  Kaolinite 
  Group 
  Al 
  2 
  3 
  2Si0 
  o 
  2H 
  3 
  + 
  aq. 
  0. 
  

  

  3. 
  Al 
  9 
  0,2Si0 
  9 
  3H 
  a 
  O. 
  

  

  4. 
  Newtonite 
  Al 
  2 
  3 
  2Si0 
  2 
  4H 
  2 
  0+aq. 
  Rhombohedral. 
  

  

  In 
  the 
  case 
  of 
  other 
  hydrous 
  silicates 
  of 
  alumina, 
  as 
  well 
  as 
  

   of 
  magnesia 
  and 
  other 
  bases, 
  similar 
  homologous 
  series 
  could 
  

   be 
  formed, 
  which 
  would 
  tend 
  toward 
  a 
  more 
  systematic 
  

   arrangement 
  of 
  the 
  species 
  than 
  now 
  exists. 
  

  

  Chem. 
  and 
  Petrog. 
  Laboratory 
  of 
  the 
  Geol. 
  Survey 
  of 
  Arkansas, 
  Dec, 
  1890. 
  

  

  Art. 
  III. 
  — 
  On 
  the 
  Intensity 
  of 
  Sound. 
  — 
  II. 
  The 
  Energy 
  

   used 
  by 
  Organ 
  Pipes 
  / 
  by 
  Chakles 
  K. 
  Wead. 
  

  

  [Read 
  in 
  abstract 
  at 
  the 
  Philadelphia 
  meeting 
  of 
  the 
  American 
  Association, 
  1884.] 
  

  

  In 
  a 
  former 
  paper* 
  the 
  case 
  of 
  a 
  vibrating 
  tuning 
  fork 
  has 
  

   been 
  considered 
  as 
  an 
  important 
  example 
  of 
  sounding 
  bodies 
  

   that 
  gradually 
  expend 
  the 
  store 
  of 
  energy 
  originally 
  imparted 
  

   to 
  them. 
  We 
  have 
  now 
  to 
  consider 
  one 
  of 
  the 
  class 
  that 
  can 
  

   store 
  up 
  little 
  or 
  no 
  energy, 
  viz 
  : 
  an 
  organ 
  pipe 
  ; 
  and 
  have 
  

   therefore 
  to 
  determine, 
  not 
  the 
  rate 
  of 
  loss 
  as 
  with 
  the 
  fork 
  

   and 
  piano 
  string, 
  but 
  the 
  rate 
  at 
  which 
  energy 
  is 
  supplied 
  to 
  

   the 
  system 
  from 
  without, 
  The 
  experimental 
  problem 
  is 
  very 
  

   simple, 
  and 
  it 
  seems 
  strange 
  that 
  it 
  has 
  not 
  been 
  completely 
  

   worked 
  out. 
  

  

  The 
  literature 
  of 
  the 
  subject 
  is 
  very 
  slight. 
  Lord 
  Rayleigh,f 
  

   in 
  an 
  oft-quoted 
  experiment, 
  measured 
  the 
  pressure 
  and 
  volume 
  

   of 
  air 
  supplied 
  to 
  a 
  whistle 
  of 
  2740 
  d. 
  v., 
  and 
  so 
  found 
  the 
  

   rate 
  of 
  consumption 
  of 
  energy. 
  Several 
  years 
  earlier 
  Mr. 
  Bo- 
  

   sanquet 
  in 
  a 
  very 
  interesting 
  and 
  valuable 
  paper;); 
  discussed 
  the 
  

   relative 
  amount 
  of 
  energy 
  supplied 
  to 
  the 
  several 
  pipes 
  of 
  an 
  

  

  * 
  This 
  Journal, 
  xxvi. 
  177, 
  Sept., 
  1883. 
  % 
  Phil. 
  Mag., 
  xliv, 
  1872. 
  

  

  f 
  Proc. 
  Roy. 
  Soc, 
  xxvi, 
  248. 
  

  

  