﻿REPORT 
  OF 
  THE 
  SECRETARY 
  127 
  

  

  VOLUME 
  78 
  

  

  No. 
  3. 
  The 
  Classification 
  and 
  Distiibuflon 
  of 
  the 
  Pit 
  River 
  Indian 
  Tribes 
  of 
  

   California. 
  By 
  C. 
  Hart 
  Merrlam. 
  Decem!)er 
  31, 
  1926. 
  52 
  pp., 
  27 
  pl.s. 
  (Publ. 
  

   2874.) 
  

  

  No. 
  4. 
  Solar 
  Activity 
  and 
  Long-Period 
  Weather 
  Changes. 
  By 
  Henry 
  Helm 
  

   Clayton. 
  September 
  30, 
  192G. 
  02 
  pp., 
  13 
  text 
  figures. 
  (Publ. 
  2875.) 
  

  

  No. 
  5. 
  The 
  Distribution 
  of 
  Energy 
  Over 
  the 
  Sun's 
  Disk. 
  By 
  C. 
  G. 
  Abbot. 
  

   October 
  12, 
  1926. 
  12 
  pp., 
  1 
  pL, 
  1 
  text 
  fig. 
  (Publ. 
  2876.) 
  

  

  No. 
  6. 
  The 
  Lyell 
  and 
  Freshfield 
  Glaciers, 
  Canadian 
  Rocky 
  Mountains, 
  1926. 
  

   By 
  J. 
  Monroe 
  Thoriugton. 
  February 
  5, 
  1927. 
  8 
  pp., 
  12 
  pis. 
  (Publ. 
  2911.) 
  

  

  No. 
  7. 
  Explorations 
  and 
  Field 
  Work 
  of 
  the 
  Smithsonian 
  Institution 
  in 
  1926. 
  

   April 
  21, 
  1927. 
  259 
  pp., 
  247 
  figs. 
  (Publ. 
  2912.) 
  

  

  No. 
  8. 
  The 
  Flora 
  of 
  Barro 
  Colorado 
  Island. 
  By 
  Paul 
  C. 
  Staudley. 
  May 
  20 
  

   1927. 
  32 
  pp. 
  (Publ. 
  2914.) 
  

  

  VOLUME 
  80 
  

  

  No. 
  1. 
  Morphology 
  and 
  Mechanism 
  of 
  the 
  Insect 
  Tliorax. 
  By 
  R. 
  E. 
  Snod- 
  

   grass. 
  Bureau 
  of 
  Entomology. 
  June 
  25, 
  1927. 
  108 
  pp., 
  44 
  text 
  figs. 
  (Publ. 
  

   2915.) 
  

  

  No. 
  2. 
  A 
  Group 
  of 
  Solar 
  Changes. 
  By 
  C. 
  G. 
  Abbot. 
  April 
  25, 
  1927. 
  16 
  pp., 
  

   9 
  text 
  figs. 
  (Publ. 
  2916.) 
  

  

  SMITHSONIAN 
  ANNUAL 
  REPORTS 
  

  

  Report 
  for 
  1025. 
  — 
  The 
  complete 
  volume 
  of 
  the 
  Annual 
  Keport 
  

   of 
  the 
  Board 
  of 
  Regents 
  for 
  1925 
  was 
  received 
  from 
  the 
  Public 
  

   Printer 
  in 
  November, 
  1926. 
  

  

  Annual 
  Report 
  of 
  the 
  Board 
  of 
  Regents 
  of 
  the 
  Smithsonian 
  Institution, 
  show- 
  

   ing 
  operations, 
  expenditures, 
  and 
  condition 
  of 
  the 
  Institution 
  for 
  the 
  year 
  

   ending 
  June 
  30, 
  1925. 
  xii+633 
  pp., 
  84 
  pis., 
  77 
  text 
  figs. 
  (Publ. 
  2S3G.) 
  

  

  The 
  appendix 
  contained 
  the 
  following 
  papers: 
  

  

  The 
  spiral 
  nebulse 
  and 
  the 
  structure 
  of 
  space, 
  by 
  Carl 
  Wirtz. 
  

  

  Immensities 
  of 
  time 
  and 
  space, 
  by 
  A. 
  Yibert 
  Douglas. 
  

  

  Certain 
  aspects 
  of 
  high-pressure 
  research, 
  by 
  P. 
  W. 
  Bridgman. 
  

  

  Lightning 
  and 
  other 
  high-voltage 
  phenomena, 
  by 
  F. 
  W. 
  Peek, 
  jr. 
  

  

  Chemical 
  elements 
  and 
  atoms, 
  by 
  G. 
  Urbain. 
  

  

  The 
  manufacture 
  of 
  radium, 
  by 
  Camille 
  Matignon. 
  

  

  The 
  chemistry 
  of 
  solids, 
  by 
  Cecil 
  H. 
  Desch. 
  

  

  Terrestrial 
  magnetism 
  in 
  the 
  twentieth 
  century, 
  by 
  Daniel 
  L. 
  Ilazzard. 
  

  

  Some 
  causes 
  of 
  volcanic 
  activity, 
  by 
  Arthur 
  L. 
  Day. 
  

  

  Geology 
  in 
  the 
  service 
  of 
  man, 
  by 
  W. 
  W. 
  Watts. 
  

  

  The 
  yeasts 
  : 
  A 
  chapter 
  in 
  microscopical 
  science, 
  by 
  A. 
  Chaston 
  Chapman. 
  

  

  Tropical 
  cyclones 
  and 
  the 
  dispersal 
  of 
  life 
  from 
  island 
  to 
  island 
  in 
  the 
  Pacific. 
  

  

  by 
  Stephen 
  Sargent 
  Visher. 
  

   Isolation 
  with 
  segregation 
  as 
  a 
  factor 
  in 
  organic 
  evolution, 
  by 
  David 
  Starr 
  

  

  Jordan. 
  

   The 
  biological 
  action 
  of 
  light, 
  by 
  Leonard 
  Hill. 
  

   Animal 
  life 
  at 
  high 
  altitudes, 
  by 
  Maj. 
  R. 
  W. 
  G. 
  Hingston. 
  

   The 
  nest 
  of 
  the 
  Indian 
  tailor 
  bird, 
  by 
  Casey 
  A. 
  Wood. 
  

   The 
  needs 
  of 
  the 
  world 
  as 
  to 
  entomology, 
  by 
  L. 
  O. 
  Howard. 
  

   From 
  an 
  egg 
  to 
  an 
  insect, 
  by 
  R. 
  E. 
  Snodgrass. 
  

  

  