﻿162 
  Scientific 
  Intelligence. 
  

  

  having 
  H^O 
  more 
  ; 
  a 
  difference 
  which 
  the 
  author 
  attributes 
  to 
  

   the 
  mode 
  of 
  drying. 
  As 
  they 
  have 
  the 
  same 
  solubility, 
  optical 
  

   activity 
  and 
  refractive 
  index, 
  they 
  are 
  probably 
  identical. 
  Stu- 
  

   rine 
  is 
  more 
  soluble 
  than 
  the 
  others, 
  and 
  its 
  sulphate, 
  which 
  is 
  an 
  

   oil, 
  has 
  the 
  probable 
  formula 
  (C3JI,,N^30,)^ 
  . 
  (H^SOJ,,. 
  By 
  

   hydrolysis, 
  protones 
  or 
  peptones 
  of 
  the 
  protamines 
  are 
  lirst 
  pro- 
  

   duced. 
  Then 
  the 
  hexon 
  bases 
  appear, 
  histidine, 
  arginine 
  and 
  

   lysine. 
  Clupeine 
  gives 
  a 
  molecule 
  each 
  of 
  histidine 
  and 
  lysine 
  

   and 
  three 
  of 
  arginine, 
  while 
  the 
  sturine 
  gives 
  one 
  molecule 
  of 
  

   histidine, 
  two 
  of 
  lysine 
  and 
  three 
  of 
  arginine. 
  Since 
  proteids 
  as 
  

   well 
  as 
  protomines 
  yield 
  these 
  hexon 
  bases, 
  it 
  is 
  reasonable 
  to 
  sup- 
  

   pose 
  that 
  the 
  albumin 
  molecule 
  contains 
  a 
  protamine 
  complex. 
  

   To 
  this 
  are 
  attached 
  other 
  groups 
  which 
  yield 
  the 
  amido 
  acids 
  of 
  

   the 
  fatty 
  series, 
  a 
  third 
  group 
  gives 
  tyrosine, 
  and 
  a 
  fourth 
  the 
  

   decomposition 
  products 
  containing 
  sulphur. 
  — 
  Zeitschr. 
  physiol, 
  

   Chem. 
  XXV, 
  165-189, 
  1898. 
  g. 
  f. 
  b. 
  

  

  6. 
  0?i 
  HcBmochromogen. 
  — 
  Hgemochromogen 
  has 
  been 
  prepared 
  

   by 
  Von 
  Zeynek 
  by 
  reducing 
  an 
  ammoniacal 
  alcoholic 
  solution 
  of 
  

   haematin 
  with 
  hydrazine 
  hydrate 
  in 
  an 
  apparatus 
  from 
  which 
  

   both 
  oxygen 
  and 
  moisture 
  could 
  be 
  excluded. 
  From 
  the 
  solution 
  

   it 
  is 
  precipitated 
  by 
  a 
  mixture 
  of 
  alcohol 
  and 
  ether 
  as 
  a 
  red 
  amor- 
  

   phous 
  mass 
  resembling 
  red 
  phosphorus. 
  As 
  a 
  mean 
  of 
  five 
  

   analyses, 
  the 
  following 
  numbers 
  were 
  obtained 
  : 
  C 
  63.83, 
  H 
  5.66, 
  

   Fe 
  9.25, 
  N 
  11.48, 
  O 
  9.78. 
  Since 
  the 
  formula 
  of 
  hiematin 
  itself 
  is 
  

   doubtful, 
  these 
  numbers 
  cannot 
  lead 
  to 
  any 
  definite 
  conclusion 
  as 
  

   to 
  the 
  constitution 
  of 
  haemochromogen. 
  When 
  its 
  solution 
  in 
  

   ammonia 
  is 
  neutralized 
  with 
  acetic 
  acid, 
  a 
  voluminous 
  brownish- 
  

   red 
  precipitate 
  is 
  thrown 
  down 
  which 
  contains 
  iron, 
  and 
  on 
  

   redissolving 
  it 
  in 
  ammonia 
  shows 
  the 
  characteristic 
  spectrum 
  of 
  

   hsemochromogen. 
  This 
  substance 
  appears 
  to 
  be 
  the 
  only 
  product 
  

   of 
  the 
  action 
  of 
  hydrazine 
  hydrate 
  on 
  haematin 
  ; 
  while 
  with 
  

   oxybaemoglobin 
  and 
  methaemoglobin 
  the 
  action 
  goes 
  farther, 
  pro- 
  

   ducing 
  hasmoglobin, 
  then 
  hnemochromogen 
  ; 
  the 
  solution 
  becoming 
  

   9>oon 
  ^eGoXoiizQ^. 
  — 
  Zeitschr. 
  Physiol. 
  Chem.,xxv, 
  492-506, 
  1898. 
  

  

  G. 
  F. 
  B. 
  

  

  1. 
  Geschichte 
  der 
  Physikalischen 
  Experimentierkunst. 
  Von 
  

   Dr. 
  E. 
  Gerland 
  und 
  Dr. 
  F. 
  Traumuller; 
  pp. 
  442. 
  Leipzig, 
  

   1899. 
  (Wilhelm 
  Engelmann.) 
  — 
  This 
  volume 
  occupies 
  quite 
  anew 
  

   field. 
  There 
  have 
  been 
  histories 
  of 
  physics 
  which 
  have 
  given 
  an 
  

   account 
  of 
  the 
  development 
  of 
  physical 
  laws 
  and 
  principles, 
  but 
  

   here 
  we 
  have 
  the 
  course 
  of 
  experiment 
  detailed 
  from 
  the 
  earliest 
  

   time 
  down 
  to 
  the 
  first 
  half 
  of 
  the 
  present 
  century. 
  Some 
  of 
  the 
  

   opening 
  pages 
  are 
  given 
  to 
  the 
  Egyptians 
  and 
  their 
  work 
  in 
  

   metallurgy, 
  and 
  then 
  follows 
  an 
  account 
  of 
  the 
  discoveries 
  of 
  the 
  

   Greeks 
  and 
  Romans, 
  the 
  Byzantines 
  and 
  Arabians 
  until 
  we 
  reach 
  

   the 
  scientific 
  awakening 
  of 
  the 
  sixteenth 
  century. 
  From 
  here 
  on, 
  

   one 
  familiar 
  subject 
  alter 
  another 
  is 
  developed, 
  and 
  it 
  is 
  highly 
  

   interesting 
  to 
  see 
  how 
  many 
  experiments 
  and 
  illustrations 
  which 
  

   still 
  live 
  in 
  modern 
  text-books 
  had 
  their 
  origin 
  several 
  hundred 
  

   years 
  ago. 
  The 
  figures 
  introduced 
  are 
  numerous 
  and 
  well 
  chosen 
  

  

  