﻿494 
  Scientific 
  Intelligence. 
  

  

  ferences 
  in 
  the 
  dielectric 
  constant 
  is 
  simple 
  and 
  ingenious. 
  The 
  

   two 
  plates 
  of 
  an 
  Epinus 
  condenser, 
  somewhat 
  separated, 
  are 
  con- 
  

   nected, 
  the 
  one 
  with 
  a 
  charged 
  Leyden 
  jar, 
  the 
  other 
  with 
  a 
  gold 
  

   leaf 
  electroscope. 
  On 
  placing 
  various 
  dielectrics 
  between 
  the 
  

   plates, 
  the 
  divergence 
  of 
  the 
  leaves 
  increases 
  in 
  proportion 
  as 
  the 
  

   dielectric 
  constant 
  is 
  greater. 
  G. 
  f. 
  b. 
  

  

  6. 
  OstwalcVs 
  Klassiker 
  cler 
  exakten 
  Wissenschaften. 
  — 
  The 
  fol- 
  

   lowing 
  additions 
  have 
  been 
  made 
  to 
  this 
  valuable 
  series 
  of 
  scien- 
  

   tific 
  classics 
  : 
  

  

  Nr. 
  80. 
  Theorie 
  der 
  Luftschwingungen 
  in 
  Rohren 
  mit 
  Offenen 
  

   Enden 
  von 
  H. 
  Helmholtz. 
  (1859.) 
  132 
  pp. 
  

  

  Nr. 
  81. 
  Experimental-Untersuchungen 
  iiber 
  Elektricitat 
  von 
  

   Michael 
  Faraday. 
  lundllReihe. 
  (1832.) 
  96 
  pp. 
  

  

  Nr. 
  82, 
  83. 
  Systematische 
  Entwicklung 
  der 
  Abhangigkeit 
  geom- 
  

   etrischer 
  Gestalten 
  von 
  einander, 
  mit 
  Beriicksichtigung 
  der 
  Arbei- 
  

   ten 
  alter 
  and 
  nener 
  Geometer 
  iiber 
  Porismen, 
  Projections- 
  

   Methoden, 
  Geometrie 
  der 
  Lage, 
  Transversalen, 
  Dualitat, 
  und 
  

   Reciprocity, 
  etc., 
  von 
  Jacob 
  Steiner. 
  I 
  Theil., 
  126 
  pp., 
  II 
  Theil., 
  

   162 
  pp. 
  

  

  r 
  1. 
  La 
  cause 
  premiere 
  tfapres 
  les 
  donnees 
  experimentales 
  ; 
  by 
  

   Emile 
  Ferriere; 
  pp. 
  462. 
  (Paris: 
  Felix 
  Alcan, 
  1897.) 
  — 
  In 
  two 
  

   previous 
  works 
  the 
  author 
  has 
  reached 
  the 
  conclusions 
  that 
  there 
  

   is 
  a 
  unity 
  to 
  the 
  laws 
  of 
  matter 
  and 
  energy 
  throughout 
  the 
  uni- 
  

   verse; 
  a 
  substantial 
  identity 
  of 
  matter 
  and 
  energy; 
  a 
  unity 
  of 
  life 
  

   in 
  plants 
  and 
  animals; 
  the 
  soul 
  ("l'Ame") 
  is 
  the 
  function 
  of 
  the 
  

   brain. 
  In 
  the 
  present 
  work, 
  he 
  completes 
  the 
  series 
  of 
  his 
  

   investigations, 
  which 
  he 
  has 
  undertaken 
  in 
  the 
  spirit 
  of 
  Claude 
  

   Bernard, 
  and 
  reaches 
  the 
  conclusion 
  that 
  there 
  is 
  one 
  substance, 
  

   the 
  exterior 
  manifestation 
  of 
  which 
  is 
  matter-energy. 
  When 
  this 
  

   permanent 
  source 
  or 
  substance 
  is 
  viewed 
  from 
  the 
  point 
  of 
  view 
  

   of 
  truth, 
  it 
  takes 
  the 
  name 
  of 
  primary 
  cause 
  ; 
  when 
  viewed 
  from 
  

   the 
  point 
  of 
  view 
  of 
  the 
  real, 
  it 
  is 
  the 
  world. 
  In 
  discussing 
  these 
  

   metaphysical 
  points 
  the 
  author 
  gives 
  an 
  elaborate 
  synopsis 
  of 
  the 
  

   creation 
  of 
  the 
  animal 
  and 
  of 
  the 
  vegetable 
  kingdom. 
  

  

  8. 
  Den 
  Norske 
  Nor 
  dhavs- 
  Exp 
  edition 
  1876-1878. 
  Christiania, 
  

   1896. 
  — 
  Part 
  XXIII 
  of 
  the 
  seventh 
  volume 
  of 
  this 
  most 
  valuable 
  

   work, 
  devoted 
  to 
  the 
  results 
  of 
  the 
  Norwegian 
  North 
  Atlantic 
  

   Expedition, 
  has 
  recently 
  been 
  issued. 
  It 
  contains 
  the 
  following 
  

   papers 
  on 
  the 
  Tunicata 
  : 
  1. 
  Synascidiaa. 
  2. 
  Ascidiaa 
  Simplicesog 
  

   Ascidiae 
  Compositae. 
  3. 
  Fortegnelse 
  over 
  Norges 
  Ascidise 
  Sim- 
  

   plices. 
  4. 
  Om 
  Knopskydningen 
  hos 
  Distaplia 
  Magnilarva 
  og 
  

   Pyrosoma 
  Elegans. 
  5. 
  Kimbladstudier 
  paa 
  Grundlag 
  af 
  As- 
  

   cidiernes 
  Udvikling. 
  Christiania, 
  1896 
  : 
  Grondahl 
  & 
  Sons. 
  

  

  