﻿REPORT 
  OF 
  THE 
  SECRETARY. 
  41 
  

  

  60,681 
  books 
  and 
  95,594 
  pamphlets. 
  Typewritten 
  lists 
  of 
  original 
  

   articles 
  appearing 
  in 
  scientific 
  periodicals 
  reaching 
  the 
  Institution 
  

   for 
  the 
  Smithsonian 
  deposit 
  at 
  the 
  Library 
  of 
  Congress 
  have 
  been 
  

   circulated 
  among 
  the 
  head 
  curators 
  of 
  the 
  Museum 
  for 
  their 
  informa- 
  

   tion 
  and 
  dissemination 
  among 
  the 
  staff 
  generally. 
  There 
  is 
  a 
  demand 
  

   from 
  other 
  Government 
  departments 
  and 
  research 
  organizations 
  for 
  

   copies 
  of 
  these 
  lists 
  which 
  the 
  Museum 
  is 
  unable 
  to 
  supply, 
  through 
  

   lack 
  of 
  mechanical 
  equipment 
  and 
  assistants. 
  

  

  The 
  number 
  of 
  visitors 
  to 
  the 
  Natural 
  History 
  Building 
  was 
  

   441,604; 
  to 
  the 
  Arts 
  and 
  Industries 
  Building, 
  262,151; 
  to 
  the 
  Smith- 
  

   sonian 
  Building, 
  83,384; 
  and 
  to 
  the 
  Aircraft 
  Building, 
  46,380. 
  All 
  

   the 
  Museum 
  exhibition 
  halls 
  are 
  open 
  free 
  to 
  the 
  public 
  every 
  week- 
  

   day 
  in 
  the 
  year. 
  In 
  addition 
  those 
  in 
  the 
  Natural 
  History 
  Building 
  

   are 
  open 
  every 
  Sunday 
  afternoon, 
  and 
  this 
  year 
  those 
  in 
  the 
  Smith- 
  

   sonian 
  Building 
  were 
  open 
  on 
  Sunday 
  afternoons 
  in 
  April. 
  All 
  the 
  

   Museum 
  offices 
  and 
  exhibition 
  halls 
  were 
  closed, 
  however, 
  on 
  Novem- 
  

   ber 
  11, 
  1921, 
  on 
  account 
  of 
  the 
  burial 
  of 
  America's 
  unknown 
  soldier. 
  

  

  Respectfully 
  submitted. 
  

  

  W. 
  DE 
  C. 
  Ravenel, 
  

   Administrative 
  Assistant 
  to 
  the 
  Secretary, 
  in. 
  charge 
  

  

  United 
  States 
  National 
  Museum. 
  

  

  Dr. 
  Charles 
  D. 
  Walcott, 
  

  

  Secretary, 
  Smithsonian 
  Institution. 
  

  

  