﻿CONTENTS. 
  

  

  Page 
  

  

  Art. 
  XVII. 
  — 
  The 
  Piedmont 
  Terraces 
  of 
  the 
  Northern 
  Appa- 
  

   lachians 
  ; 
  by 
  Joseph 
  Barrell 
  • 
  . 
  227 
  

  

  Art. 
  XVIII. 
  — 
  A 
  Model 
  for 
  Demonstrating 
  Crystal 
  Struc- 
  

   ture 
  ; 
  by 
  Herbert 
  P. 
  Whitlock 
  259 
  

  

  Art. 
  XIX. 
  — 
  The 
  Devonian 
  of 
  Central 
  Missouri; 
  by 
  Darl- 
  

   ing 
  K. 
  GrREGER 
  265 
  

  

  Art. 
  XX. 
  — 
  A 
  Geologic 
  Section 
  from 
  40 
  Miles 
  West 
  of 
  St. 
  

   Louis' 
  County 
  to 
  Jackson 
  County, 
  Missouri; 
  by 
  E. 
  B. 
  

   Branson 
  . 
  . 
  267 
  

  

  Art. 
  XXI. 
  — 
  On 
  the 
  Occurrence 
  of 
  Dyscrasite 
  in 
  Australia; 
  

  

  by 
  George 
  Smith 
  = 
  278 
  

  

  Art. 
  XXII. 
  — 
  The 
  Comanchean 
  and 
  Dakota 
  Strata 
  of 
  Kan- 
  

   sas; 
  by 
  W. 
  H. 
  Twenhofel 
  281 
  

  

  SCIENTIFIC 
  INTELLIGENCE. 
  

  

  Chemistry 
  and 
  Physics 
  — 
  Potassium 
  Nitrate 
  from 
  the 
  Chilean 
  Nitrate 
  Industry, 
  

   P. 
  F. 
  Holstein 
  : 
  A 
  Hydride 
  of 
  Tin, 
  Peneth 
  and 
  Furth, 
  298. 
  — 
  A 
  New 
  

   Indicator 
  for 
  Bases 
  and 
  Acids, 
  M. 
  Chauvierre 
  : 
  Chemically 
  Reactive 
  

   Alloys, 
  E. 
  A. 
  Ashcroft, 
  299. 
  — 
  The 
  Preparation 
  of 
  Organic 
  Compounds, 
  

   E. 
  DeBarry 
  Barnett 
  : 
  The 
  Value 
  of 
  the 
  Rydberg 
  Series 
  Constant, 
  W. 
  E. 
  

   Curtis, 
  300. 
  — 
  Experiments 
  with 
  Perforated 
  Electrodes 
  on 
  the 
  Nature 
  of 
  

   the 
  Discharge 
  in 
  Gases 
  at 
  Low 
  Pressures, 
  F. 
  W. 
  Aston, 
  301. 
  — 
  The 
  Line 
  

   Spectrum 
  of 
  Sodium 
  as 
  Excited 
  by 
  Fluorescence, 
  R. 
  J. 
  Strutt, 
  302. 
  — 
  Elec- 
  

   tric 
  Oscillations 
  and 
  Electric 
  Waves, 
  George 
  W. 
  Pierce, 
  303. 
  — 
  The 
  

   Book 
  of 
  the 
  Damned, 
  C. 
  Fort: 
  Mesures 
  Pratiques 
  en 
  Radioactivite, 
  W. 
  

   Makower 
  and 
  H. 
  Geiger, 
  304. 
  

  

  Geology— 
  Factors 
  of 
  Climatic 
  Control, 
  W. 
  J. 
  Humphreys: 
  Ueber 
  fragliche 
  

   Tunicaten 
  aus 
  dem 
  Perm 
  Siciliens, 
  etc., 
  O. 
  Jaekel, 
  305. 
  — 
  The 
  Environ- 
  

   ment 
  of 
  Vertebrate 
  Life 
  in 
  the 
  Late 
  Paleozoic 
  in 
  North 
  America 
  ; 
  a 
  Paleo- 
  

   geographic 
  Study. 
  E. 
  C. 
  Case 
  : 
  Die 
  Trilobiten 
  der 
  Zone 
  D-di 
  von 
  Prag 
  und 
  

   Umgebung, 
  O. 
  Novak, 
  306. 
  — 
  Kritische 
  Studien 
  ueber 
  die 
  Terebratula- 
  

   Arten 
  der 
  schwedischen 
  Kreideformation, 
  A. 
  Hadding 
  : 
  A 
  Catalogue 
  of 
  

   the 
  Mesozoic 
  and 
  Cenozoic 
  Plants 
  of 
  North 
  America, 
  F. 
  H. 
  Knowlton 
  : 
  

   Stratigraphy 
  and 
  Correlation 
  of 
  the 
  Devonian 
  of 
  Western 
  Tennessee, 
  etc. 
  , 
  

   Carl 
  O. 
  Dunbar, 
  307. 
  — 
  Paleogeography 
  and 
  Diastrophism 
  in 
  the 
  Atlantic- 
  

   Arctic 
  Region 
  during 
  Paleozoic 
  Time, 
  O. 
  Holtedahl 
  (Corrections) 
  308. 
  

  

  Miscellaneous 
  Scientific 
  Intelligence 
  — 
  Report 
  of 
  the 
  Librarian 
  of 
  Congress, 
  

   Herbert 
  Putnam; 
  also 
  Report 
  of 
  the 
  Superintendent 
  of 
  the 
  Library 
  Build- 
  

   ing 
  and 
  Grounds, 
  F. 
  L. 
  Averill, 
  for 
  the 
  fiscal 
  year 
  ending 
  June 
  30, 
  1919, 
  

   309. 
  — 
  Commonwealth 
  of 
  Australia, 
  Institute 
  of 
  Science 
  and 
  Industry, 
  

   John 
  Read 
  and 
  H. 
  G. 
  Smith 
  : 
  Special 
  Library 
  Census, 
  310. 
  

  

  