﻿376 
  Scientific 
  Intelligence. 
  

  

  lengthening 
  it. 
  Possibly 
  it 
  has 
  been 
  supposed 
  that 
  short 
  swings 
  

   would 
  be 
  more 
  likely 
  to 
  stop 
  or 
  to 
  be 
  erratic 
  than 
  long 
  ones, 
  but 
  

   this 
  is 
  contrary 
  to 
  the 
  very 
  great 
  amount 
  of 
  experience 
  of 
  those 
  

   who 
  use 
  short 
  swings, 
  and 
  it 
  is 
  contrary 
  also 
  to 
  the 
  precepts 
  of 
  

   high 
  authorities, 
  such 
  as 
  Fresenius 
  and 
  Carnot, 
  already 
  alluded 
  

   to 
  in 
  this 
  article. 
  There 
  is 
  little 
  doubt 
  that 
  many 
  have 
  merely 
  

   followed 
  the 
  example 
  of 
  others 
  in 
  adopting 
  this 
  astonishing 
  prac- 
  

   tice, 
  without 
  due 
  consideration 
  of 
  the 
  matter, 
  and 
  perhaps 
  the 
  

   mathematical 
  and 
  physical 
  aspects 
  of 
  the 
  method, 
  or 
  possibly 
  its 
  

   spectacular 
  features, 
  have 
  had 
  some 
  influence 
  in 
  leading 
  to 
  its 
  

   adoption. 
  

  

  It 
  is 
  to 
  be 
  hoped 
  that 
  all 
  recommendations 
  of 
  long-swing 
  

   weighing 
  will 
  soon 
  disappear 
  from 
  our 
  text-books 
  of 
  quantita- 
  

   tive 
  analysis, 
  so 
  that 
  our 
  future 
  workers 
  in 
  chemistry 
  may 
  not 
  

   be 
  in 
  danger 
  of 
  being 
  burdened 
  with 
  a 
  preposterously 
  laborious 
  

   method." 
  — 
  Jour. 
  Amer. 
  Chem. 
  Soc, 
  42, 
  411. 
  h. 
  l. 
  w. 
  

  

  2. 
  The 
  Use 
  of 
  Cup 
  f 
  err 
  on 
  in 
  Quantitative 
  Analysis. 
  — 
  The 
  

   ammonium 
  salt 
  of 
  nitrosophenylhydroxylamine, 
  C 
  6 
  H 
  5 
  .N.NO.- 
  

   ONH 
  4 
  , 
  to 
  which 
  the 
  shorter 
  name 
  cupferron 
  was 
  given 
  as 
  indi- 
  

   cating 
  the 
  fact 
  that 
  copper 
  and 
  iron 
  are 
  precipitated 
  by 
  its 
  use 
  

   as 
  a 
  reagent, 
  has 
  attracted 
  considerable 
  attention 
  among, 
  analyt- 
  

   ical 
  chemists 
  since 
  its 
  introduction 
  about 
  10 
  years 
  ago, 
  and 
  it 
  

   has 
  been 
  frequently 
  employed 
  for 
  quantitative 
  separations 
  and 
  

   determinations. 
  G. 
  E. 
  F. 
  Lundell 
  and 
  H. 
  B. 
  Knowles, 
  of 
  the 
  

   U. 
  S. 
  Bureau 
  of 
  Standards 
  have 
  recently 
  performed 
  a 
  useful 
  

   service 
  by 
  reviewing 
  the 
  possibilities 
  and 
  limitations 
  in 
  the 
  em- 
  

   ployment 
  of 
  this 
  reagent 
  in 
  connection 
  with 
  a 
  study 
  of 
  their 
  

   own 
  in 
  regard 
  to 
  its 
  application 
  for 
  the 
  determination 
  of 
  zir- 
  

   conium 
  in 
  its 
  ores 
  and 
  metallurgical 
  products. 
  It 
  is 
  their 
  con- 
  

   clusion 
  that 
  cupferron 
  can 
  be 
  used 
  advantageously 
  in 
  certain 
  

   separations, 
  such 
  as 
  iron 
  from 
  manganese, 
  and 
  iron 
  and 
  titanium 
  

   from 
  aluminium 
  and 
  manganese, 
  but 
  that 
  many 
  elements 
  inter- 
  

   fere 
  with 
  its 
  use 
  in 
  the 
  quantitative 
  determination 
  of 
  copper, 
  

   iron, 
  titanium, 
  zirconium, 
  thorium 
  and 
  vanadium. 
  Not 
  only 
  

   does 
  each 
  one 
  of 
  the 
  elements 
  just 
  mentioned 
  interfere 
  with 
  the 
  

   determination 
  of 
  any 
  of 
  the 
  others, 
  but 
  it 
  is 
  to 
  be 
  observed 
  that 
  

   there 
  are 
  many 
  other 
  interfering 
  substances, 
  such 
  as 
  lead, 
  silver, 
  

   mercury, 
  tin, 
  bismuth, 
  cerium, 
  thorium, 
  tungsten, 
  uranium 
  in 
  

   the 
  quadrivalent 
  condition, 
  silica, 
  and 
  in 
  certain 
  cases 
  when 
  

   present 
  in 
  large 
  amounts, 
  phosphoric 
  acid, 
  alkali 
  salts 
  and 
  alka- 
  

   line 
  earths. 
  It 
  is 
  evident 
  that 
  the 
  reagent 
  should 
  be 
  employed 
  

   only 
  with 
  proper 
  precautions. 
  — 
  Jour. 
  Indust. 
  Engr. 
  Chem., 
  12, 
  

   344. 
  h. 
  l, 
  w. 
  

  

  3. 
  A 
  Course 
  of 
  Practical 
  Chemistry 
  for 
  Agricultural 
  Stu- 
  

   dents, 
  Volume 
  II, 
  Part 
  I; 
  by 
  IT. 
  A. 
  D. 
  Neville 
  and 
  L. 
  F. 
  

   Newman. 
  8vo, 
  pp. 
  122. 
  Cambridge, 
  England, 
  1919 
  (at 
  the 
  

   University 
  Press). 
  — 
  The 
  little 
  book 
  under 
  consideration 
  is 
  the 
  

   first 
  of 
  two 
  parts 
  of 
  the 
  second 
  volume, 
  the 
  whole 
  work 
  consist- 
  

   ing 
  of 
  three 
  volumes. 
  This 
  part 
  is 
  devoted 
  to 
  such 
  exercises 
  in 
  

  

  