﻿Miscellaneous 
  Intelligence. 
  393 
  

  

  and 
  photographers 
  are 
  cautioned 
  to 
  develop 
  images 
  slowly 
  and 
  

   to 
  keep 
  them 
  as 
  thin 
  and 
  transparent 
  as 
  possible, 
  and 
  to 
  "back" 
  

   all 
  plates 
  to 
  prevent 
  halation. 
  

  

  A 
  matter 
  beyond 
  the 
  scope 
  of 
  the 
  circular 
  but 
  of 
  much 
  interest 
  

   for 
  spectroscopic 
  work 
  is 
  the 
  redetermination 
  of 
  the 
  principal 
  line 
  

   of 
  the 
  corona. 
  Professor 
  Young 
  has 
  published 
  a 
  note 
  calling 
  

   attention 
  to 
  the 
  important 
  fact 
  that 
  the 
  photographs 
  made 
  by 
  

   Campbell 
  and 
  the 
  English 
  observers 
  in 
  India 
  show 
  that 
  the 
  old 
  

   1474 
  K 
  line 
  is 
  in 
  error. 
  Special 
  attention 
  should 
  be 
  given 
  to 
  it 
  

   in 
  the 
  coming 
  eclipse. 
  w. 
  b. 
  

  

  2. 
  Total 
  Eclipses 
  of 
  the 
  Sun; 
  by 
  Mabel 
  Loomis 
  Todd. 
  Pp. 
  

   273, 
  Revised 
  edition. 
  Boston, 
  1900 
  (Little, 
  Brown 
  & 
  Co.). 
  — 
  

   No 
  one 
  on 
  this 
  side, 
  or 
  perhaps 
  on 
  either 
  side, 
  of 
  the 
  Atlantic 
  has 
  

   labored 
  more 
  or 
  traveled 
  farther 
  in 
  eclipse 
  work 
  than 
  Professor 
  

   Todd. 
  

  

  His 
  wife 
  has 
  shared 
  his 
  travels 
  and 
  to 
  some 
  extent 
  his 
  labors, 
  

   and 
  has 
  supplemented 
  them 
  by 
  a 
  volume 
  written 
  in 
  a 
  thoroughly 
  

   scientific 
  spirit 
  and 
  in 
  the 
  " 
  handy 
  science 
  " 
  form. 
  The 
  special 
  

   merits 
  of 
  the 
  book 
  have 
  been 
  noticed 
  at 
  its 
  first 
  appearance. 
  

   The 
  second 
  edition 
  is 
  opportunely 
  brought 
  out 
  while 
  interest 
  is 
  

   aroused 
  in 
  this 
  country 
  by 
  the 
  coming 
  eclipse 
  of 
  May, 
  and 
  brings 
  

   the 
  work 
  down 
  so 
  as 
  to 
  include 
  the 
  eclipses 
  of 
  '96 
  and 
  '98 
  

   observed 
  in 
  Nova 
  Zembla 
  and 
  India. 
  

  

  IV. 
  Miscellaneous 
  Scientific 
  Intelligence. 
  

  

  1. 
  National 
  Academy 
  of 
  Sciences. 
  — 
  The 
  spring 
  meeting 
  of 
  the 
  

   National 
  Academy 
  was 
  held 
  at 
  Washington 
  from 
  April 
  17th 
  to 
  

   19th. 
  The 
  President, 
  Dr. 
  Wolcott 
  Gibbs, 
  presided. 
  The 
  list 
  of 
  

   papers 
  accepted 
  for 
  reading 
  is 
  as 
  follows 
  : 
  

  

  S. 
  F. 
  Emmoxs: 
  Secondar}^ 
  enrichment 
  of 
  sulphides 
  in 
  ore 
  deposits. 
  

  

  A. 
  Agassiz: 
  The 
  cruise 
  of 
  the 
  U. 
  S. 
  Fish 
  Commission 
  Steamer 
  "Albatross 
  " 
  in 
  

   the 
  South 
  Seas, 
  August, 
  1899 
  to 
  March, 
  1900. 
  

  

  Theodore 
  Gill 
  : 
  On 
  the 
  Zoogeographical 
  relationships 
  of 
  Africa. 
  

  

  Simon 
  Xewcomb 
  : 
  Report 
  of 
  the 
  Watson 
  trustees 
  on 
  the 
  award 
  of 
  the 
  Watson 
  

   medal 
  to 
  David 
  Gill. 
  

  

  F. 
  W. 
  Putnam: 
  A 
  human 
  bone 
  from 
  the 
  g-lacial 
  deposit 
  at 
  Trenton, 
  N. 
  J. 
  

  

  L. 
  E. 
  Griffix: 
  The 
  anatomy 
  of 
  Nautilus 
  pompilius. 
  

  

  J. 
  1']. 
  Duerdex: 
  West 
  Indian 
  Madreporarian 
  polyps. 
  

  

  Reginald 
  A. 
  Fessexdex: 
  On 
  the 
  use 
  of 
  electric 
  motors, 
  of 
  the 
  shunt 
  type, 
  

   for 
  solving 
  linear 
  differential 
  equations 
  of 
  any 
  order 
  with 
  variable 
  coefficients. 
  

   On 
  the 
  prediction 
  of 
  the 
  physical 
  properties 
  of 
  the 
  pure 
  metals. 
  

  

  Rollix 
  A. 
  Harris: 
  A 
  partial 
  explanation 
  of 
  some 
  of 
  the 
  principal 
  tides. 
  

  

  The 
  following 
  gentlemen 
  were 
  elected 
  members 
  of 
  the 
  Academy 
  : 
  

   James 
  E. 
  Keeler 
  of 
  the 
  Lick 
  Observatory, 
  Mt. 
  Hamilton, 
  Cali- 
  

   fornia 
  ; 
  Henry 
  F. 
  Osborn 
  and 
  Franz 
  Boas 
  of 
  Columbia 
  University, 
  

   New 
  York 
  City; 
  Samuel 
  F. 
  Penfield 
  of 
  Yale 
  Univeisity, 
  New 
  

   Haven. 
  The 
  Academy 
  was 
  entertained 
  by 
  the 
  Washington 
  

   Academy 
  of 
  Sciences 
  on 
  Wednesday 
  evening 
  the 
  18th. 
  The 
  

   autumn 
  meeting 
  is 
  appointed 
  for 
  November 
  13th 
  at 
  Providence, 
  

   R. 
  I. 
  

  

  Am. 
  Jour. 
  Scl— 
  Fourth 
  Series, 
  Vol. 
  IX, 
  No. 
  53 
  —May, 
  1900. 
  

   27 
  

  

  