﻿•BEOKER 
  BROTHERS, 
  

   No. 
  6 
  Murray 
  Street, 
  New 
  York, 
  

   Manufacturers 
  of 
  Balances 
  and 
  Weights 
  of 
  Precision 
  for 
  Chem- 
  

   ists, 
  Assayers, 
  Jewelers, 
  Druggists, 
  and 
  in 
  general 
  for 
  every 
  use 
  

   where 
  accuracy 
  is 
  required. 
  

  

  AMERICAN 
  JOURNAL 
  OF 
  SCIENCE. 
  

  

  Founded 
  by 
  Professor 
  Silliman 
  in 
  1818. 
  

  

  Devoted 
  to 
  Chemistry, 
  Physics, 
  Geology, 
  Physical 
  Geography, 
  Mineralogy, 
  

   Natural 
  History, 
  Astroeomy, 
  and 
  Meteorology. 
  

  

  Editors 
  : 
  James 
  D. 
  Dana 
  aud 
  Edward 
  S. 
  Dana. 
  

  

  Associate 
  Editors: 
  J. 
  P. 
  Cooke, 
  Jr., 
  George 
  L. 
  Goodale, 
  and 
  John 
  Trow- 
  

   bridge, 
  of 
  Cambridge, 
  H. 
  A. 
  Newton 
  and 
  A. 
  E. 
  Yerrill, 
  of 
  Yale, 
  and 
  G. 
  E. 
  

   Barker, 
  of 
  the 
  University 
  of 
  Pennsylvania, 
  Philadelphia. 
  

  

  Two 
  volumes 
  of 
  480 
  pages 
  each, 
  published 
  annually 
  in 
  MONTHLY 
  NUMBERS. 
  

  

  This 
  Journal 
  ended 
  its 
  first 
  series 
  of 
  50 
  volumes 
  as 
  a 
  quarterly 
  in 
  1845, 
  and 
  its 
  

   second 
  series 
  of 
  50 
  volumes 
  as 
  a 
  two-monthly 
  in 
  1870, 
  The 
  monthly 
  series 
  com- 
  

   menced 
  in 
  1871. 
  

  

  Twenty 
  copies 
  of 
  each 
  original 
  communication 
  are, 
  if 
  requested, 
  in 
  advance 
  struck 
  

   off 
  for 
  the 
  author 
  without 
  charge; 
  arid 
  more 
  at 
  the 
  author's 
  expense, 
  provided 
  the 
  

   number 
  of 
  copies 
  desired 
  is 
  stated 
  on 
  the 
  manuscript 
  or 
  communicated 
  to 
  the 
  

   printers 
  of 
  the 
  Journal. 
  

  

  The 
  title 
  of 
  communications 
  and 
  the 
  names 
  of 
  authors 
  must 
  be 
  fully 
  given. 
  

   Articles 
  should 
  be 
  sent 
  in 
  two 
  months 
  before 
  the 
  time 
  of 
  issuing 
  the 
  number 
  for 
  

   which 
  they 
  are 
  intended. 
  Notice 
  is 
  always 
  to 
  be 
  given 
  when 
  communications 
  

   offered, 
  have 
  been, 
  or 
  are 
  to 
  be, 
  published 
  also 
  in 
  other 
  Journals. 
  

  

  Subscription 
  price 
  $6; 
  50 
  cents 
  a 
  number. 
  A 
  few 
  sets 
  on 
  sale 
  of 
  the 
  first 
  

   and 
  second 
  series. 
  

  

  Ten-volume 
  index 
  numbers 
  on 
  hand 
  for 
  the 
  second 
  and 
  third 
  series. 
  The 
  index 
  

   to 
  volume 
  xxxi 
  to 
  xl 
  (3d 
  series) 
  was 
  issued 
  in 
  January, 
  1891 
  ; 
  price 
  75 
  cents. 
  

  

  Address 
  the 
  Proprietors, 
  

  

  A 
  UNIVERSAL 
  ENGLISH-GERMAN 
  AND 
  GERMAN- 
  

   ENGLISH 
  DICTIONARY. 
  

  

  By 
  Dr. 
  Felix 
  Flitgel. 
  

  

  4th 
  editiou, 
  throughly 
  revised, 
  of 
  Dr. 
  J. 
  G. 
  Flugel's 
  Complete 
  Dic- 
  

   tionary 
  of 
  the 
  English 
  and 
  German 
  Languages. 
  

  

  Complete 
  in 
  12 
  numbers 
  of 
  14 
  signatures 
  each 
  ; 
  a 
  number 
  appears 
  

   monthly. 
  Subscription 
  price 
  for 
  each 
  number, 
  3 
  Marks. 
  

  

  George 
  Westermann, 
  Braunschweig, 
  Germany. 
  

   B. 
  Westermann 
  & 
  Co., 
  New 
  York 
  City. 
  

  

  