﻿Chemistry 
  and 
  Physics. 
  245 
  

  

  contact 
  with 
  another 
  metal 
  Wislicenits 
  ' 
  proposes 
  to 
  speak 
  of 
  as 
  

   an 
  "excited 
  " 
  metal, 
  in 
  place 
  of 
  " 
  metal 
  couple" 
  suggested 
  by- 
  

   Gladstone 
  and 
  Tribe. 
  To 
  excite 
  aluminum 
  with 
  mercury, 
  

   aluminum 
  powder 
  is 
  covered 
  with 
  a 
  one-tenth 
  saturated 
  solution 
  

   of 
  mercuric 
  chloride 
  in 
  absolute 
  alcohol 
  ; 
  and 
  after 
  a 
  few 
  seconds 
  

   the 
  product 
  is 
  washed 
  with 
  absolute 
  alcohol 
  and 
  ether. 
  Such 
  

   excited 
  aluminum 
  is 
  especially 
  adapted 
  for 
  reduction 
  in 
  neutral 
  

   solutions 
  ; 
  an 
  aqueous 
  alcoholic 
  solution 
  of 
  nitrobenzene 
  yielding 
  

   aniline 
  in 
  this 
  way, 
  unless 
  the 
  temperature 
  be 
  kept 
  at 
  40° 
  to 
  50° 
  

   when 
  /?-phenylhydroxylarnine 
  is 
  formed; 
  a 
  better 
  yield 
  of 
  the 
  lat- 
  

   ter 
  (85 
  to 
  90 
  per 
  cent 
  of 
  the 
  theoretical) 
  being 
  obtained 
  by 
  using 
  

   a 
  cooled 
  solution 
  of 
  the 
  nitrobenzene 
  in 
  ether. 
  Ethyl 
  oxalate 
  

   thus 
  treated 
  yields 
  ethyl 
  glycollate 
  and 
  alcohol. 
  — 
  J. 
  pr. 
  Chem., 
  

   II, 
  liy, 
  18, 
  August, 
  1896. 
  g. 
  f. 
  b. 
  

  

  9. 
  The 
  Constants 
  of 
  Nature. 
  Part 
  V. 
  A 
  Recalculation 
  of 
  the 
  

   Atomic 
  Weights. 
  New 
  edition, 
  revised 
  and 
  enlarged. 
  Smith- 
  

   sonian 
  Miscellaneous 
  Collections. 
  1075. 
  Washington, 
  1897. 
  — 
  

   Prof. 
  Clarke's 
  new 
  and 
  carefully 
  elaborated 
  edition 
  of 
  the 
  re-cal- 
  

   culation 
  of 
  the 
  atomic 
  weights, 
  which 
  has 
  recently 
  been 
  issued, 
  

   will 
  be 
  welcomed 
  by 
  the 
  many 
  chemists 
  who 
  have 
  been 
  benefited 
  

   by 
  his 
  earlier 
  labors 
  in 
  this 
  line. 
  

  

  10. 
  Compact 
  apparatus 
  for 
  the 
  study 
  of 
  electric 
  waves. 
  — 
  Prof. 
  

   Jagadis 
  Chunder 
  Bose 
  describes 
  a 
  very 
  compact 
  apparatus 
  for 
  

   this 
  purpose, 
  which 
  consists 
  in 
  using 
  a 
  spiral 
  steel 
  spring 
  con- 
  

   nected 
  with 
  a 
  battery 
  and 
  a 
  galvanometer. 
  The 
  spiral 
  spring 
  

   serves 
  under 
  different 
  degrees 
  of 
  compression 
  as 
  a 
  coherer 
  instead 
  

   of 
  particles 
  of 
  metals, 
  which 
  have 
  been 
  used 
  by 
  Brady 
  and 
  also 
  

   by 
  Lodge, 
  The 
  oscillator 
  consists 
  of 
  a 
  central 
  ball 
  of 
  platinum 
  

   and 
  two 
  small 
  balls 
  one 
  on 
  each 
  side 
  of 
  the 
  central 
  ball. 
  The 
  

   oscillating 
  sparks 
  occur 
  between 
  the 
  small 
  balls 
  and 
  the 
  central 
  

   ball. 
  The 
  author 
  has 
  repeated 
  most 
  of 
  the 
  ordinary 
  optical 
  phe- 
  

   nomena 
  by 
  means 
  of 
  electric 
  waves. 
  — 
  Phil. 
  Mag., 
  January, 
  1897. 
  

  

  __ 
  J. 
  T. 
  

  

  11.-4 
  new 
  formula 
  for 
  spectrum 
  waves. 
  — 
  J. 
  J. 
  Balmers' 
  empiri- 
  

   cal 
  formula 
  for 
  calculating 
  the 
  wave 
  length 
  of 
  hydrogen 
  has 
  

   awakened 
  great 
  interest 
  ; 
  for 
  values 
  calculated 
  from 
  his 
  formula 
  

   agree 
  very 
  closely 
  with 
  the 
  observed 
  values. 
  In 
  this 
  article 
  he 
  

   reviews 
  the 
  work 
  of 
  Kayser 
  and 
  Range 
  on 
  formulas 
  for 
  express- 
  

   ing 
  the 
  periodicity 
  of 
  spectrum 
  lines, 
  and 
  also 
  the 
  recent 
  work 
  of 
  

   Rydberg 
  ; 
  and 
  he 
  gives 
  a 
  modified 
  formula. 
  He 
  is 
  convinced 
  

   that 
  in 
  the 
  spectrum 
  formula 
  originally 
  given 
  the 
  constant 
  n 
  

   should 
  be 
  extended 
  by 
  a 
  constant 
  fraction. 
  He 
  therefore 
  modi- 
  

   fies 
  his 
  formula 
  and 
  writes 
  it 
  

  

  (n 
  + 
  c) 
  a 
  -b 
  

  

  in 
  which 
  a 
  has 
  the 
  value 
  of 
  2300 
  Angstrom 
  units. 
  The 
  paper 
  

   includes 
  an 
  estimation 
  of 
  the 
  values 
  of 
  c. 
  — 
  Ann. 
  der 
  Physik 
  und 
  

   Chemie^o. 
  2, 
  1897, 
  pp. 
  380-391. 
  j. 
  t. 
  

  

  Am. 
  Jour. 
  Sci. 
  — 
  Fourth 
  Series. 
  Vol. 
  III. 
  No. 
  15— 
  March, 
  189*7. 
  

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