﻿CONTENTS. 
  

  

  Number 
  251. 
  

  

  Page 
  

  

  Art. 
  XXXIY. 
  — 
  The 
  Solution 
  of 
  Vulcanized 
  India 
  Rubber 
  ; 
  

  

  by 
  Carl 
  Barus 
  _.. 
  359 
  

  

  XXXV. 
  — 
  Report 
  of 
  the 
  Examination 
  by 
  means 
  of 
  the 
  

  

  Microscope 
  of 
  Specimens 
  of 
  Infusorial 
  Earths 
  of 
  the 
  

  

  Pacific 
  Coast 
  of 
  the 
  United 
  States 
  ; 
  by 
  A. 
  M. 
  Edwards 
  369 
  

   XXXVI— 
  The 
  Tonganoxie 
  Meteorite; 
  by 
  E. 
  H. 
  S. 
  Bailey. 
  

  

  With 
  Plate 
  XIII 
  385 
  

  

  XXXVII. 
  — 
  Proposed 
  Form 
  of 
  Mercurial 
  Barometer; 
  by 
  

  

  W. 
  J. 
  Waggenee 
  387 
  

  

  XXXVIII. 
  — 
  Color 
  Photography 
  by 
  Lippmann's 
  Process 
  ; 
  by 
  

  

  C. 
  B. 
  Thwing 
  388 
  

  

  XXXIX.— 
  New 
  Analyses 
  of 
  Uraninite; 
  by 
  W. 
  F. 
  Hille- 
  

  

  BRAND 
  390 
  

  

  XL. 
  — 
  The 
  Tertiary 
  Silicified 
  Woods 
  of 
  Eastern 
  Arkansas; 
  

  

  by 
  R. 
  Ellsworth 
  Call 
  394 
  

  

  XLI. 
  — 
  Occurrence 
  of 
  Sulphur, 
  Orpiment 
  and 
  Realgar 
  in 
  the 
  

  

  Yellowstone 
  National 
  Park 
  ; 
  by 
  W. 
  H. 
  Weed 
  and 
  L. 
  

  

  V. 
  Pirssox 
  401 
  

  

  XLIL 
  — 
  Mineralogical 
  Notes 
  ; 
  by 
  L. 
  V. 
  Pirsson 
  . 
  _. 
  405 
  

  

  XLIII. 
  — 
  Peridotite 
  Dikes 
  in 
  the 
  Portage 
  Sandstones 
  near 
  

  

  Ithaca, 
  N. 
  Y.; 
  by 
  J. 
  F. 
  Kemp 
  410 
  

  

  XLIV. 
  — 
  New 
  Locality 
  for 
  Meteoric 
  Iron 
  with 
  a 
  Preliminary 
  

  

  Notice 
  of 
  the 
  Discovery 
  of 
  Diamonds 
  in 
  the 
  Iron 
  ; 
  by 
  

  

  A. 
  E. 
  Foote. 
  With 
  Plates 
  XIV, 
  XV 
  413 
  

  

  XLV. 
  — 
  The 
  South 
  Trap 
  Range 
  of 
  the 
  Keweenawan 
  Series 
  ; 
  

  

  by 
  M. 
  E. 
  Wadsworth... 
  417 
  

  

  XL 
  VI. 
  — 
  Geological 
  Facts 
  noted 
  on 
  Grand 
  River, 
  Labrador; 
  

  

  by 
  A. 
  Cart 
  . 
  419 
  

  

  SCIENTIFIC 
  INTELLIGENCE. 
  

  

  Chemistry 
  and 
  Physics 
  — 
  So-called 
  "Black 
  Sulphur" 
  of 
  Magnus, 
  Knapp, 
  422. 
  — 
  

   New 
  form 
  of 
  Silicon. 
  Wabeen: 
  New 
  Alkaloid 
  from 
  Conium 
  maculatum, 
  

   Ladenbubg 
  and 
  Adam, 
  423. 
  — 
  Iron-tetracarbonyl 
  and 
  Nickel 
  -tetracarbonyl, 
  

   Mond 
  and 
  Quincke, 
  424. 
  — 
  Sensitive 
  Reaction 
  for 
  Tartaric 
  acid, 
  Mohleb, 
  425. 
  

   — 
  Photography 
  of 
  the 
  Spectrum 
  in 
  natural 
  color, 
  Yogel: 
  Discharge 
  of 
  Elec- 
  

   tricity 
  through 
  exhausted 
  tubes 
  without 
  electrodes. 
  Thomson, 
  426. 
  — 
  Ratio 
  of 
  

   Electromagnetic 
  to 
  Electrostatic 
  units, 
  Thomson 
  and 
  Seable: 
  Expansion 
  of 
  

   Water: 
  Experiments 
  in 
  Aerodynamics, 
  Langlet, 
  427. 
  — 
  Chemical 
  Analysis 
  of 
  

   Iron, 
  Blaie. 
  428. 
  — 
  Die 
  Fortentwickelung 
  der 
  elektrischen 
  Eisenbahn-Einrich- 
  

   tungen, 
  Kohlfubst, 
  429. 
  

  

  Geology 
  and 
  Mineralogy 
  — 
  Report 
  of 
  Exploration 
  of 
  the 
  Glacial 
  Lake 
  Agassiz 
  in 
  

   Manitoba, 
  W. 
  Upham, 
  429. 
  — 
  Geological 
  Survey 
  of 
  Texas, 
  2d 
  Annual 
  Report, 
  

   1890, 
  E. 
  T. 
  Dumble: 
  Preliminary 
  Notice 
  of 
  a 
  New 
  Yttrium-Silicate, 
  W. 
  E. 
  

   Hidden, 
  430. 
  — 
  Anatase 
  from 
  the 
  Arvon 
  Slate 
  Quarries, 
  Ya., 
  G. 
  H. 
  Williams, 
  

   431. 
  — 
  Hvaite, 
  G. 
  Ch. 
  Hoffmann: 
  Synthese 
  du 
  Rubis, 
  E. 
  Feemy, 
  432. 
  — 
  Brief 
  

   notices 
  of 
  some 
  recently 
  described 
  minerals, 
  433. 
  — 
  Catalogue 
  of 
  Minerals 
  and 
  

   Synonyms, 
  T. 
  Egleston, 
  434. 
  

  

  Botany 
  — 
  Some 
  Museums 
  and 
  Botanical 
  Gardens 
  in 
  the 
  Equatorial 
  Belt 
  and 
  the 
  

   South 
  Seas, 
  434. 
  

  

  Miscellaneous 
  Scientific 
  Intelligence 
  — 
  Leidy 
  Memorial 
  Museum 
  : 
  Bibliotheca 
  Zoo- 
  

   logica, 
  0. 
  Taschenbeeg: 
  Catalogue 
  of 
  Minerals, 
  438. 
  

  

  