﻿XVIII 
  PREFACE 
  

  

  Their 
  acknowledgements 
  are 
  due 
  to 
  a 
  number 
  of 
  persons 
  who 
  have 
  

   aided, 
  but 
  particularly 
  to 
  Mr. 
  Henry 
  Gannett, 
  of 
  Washington, 
  Mr. 
  S. 
  H. 
  

   Scudder 
  and 
  Mr. 
  B. 
  P. 
  Mann, 
  of 
  Cambridge, 
  Mass., 
  Dr. 
  0. 
  S. 
  Minot, 
  of 
  

   Roslindale, 
  near 
  Boston, 
  Mr. 
  J. 
  G. 
  Lemmon, 
  of 
  Sierra 
  Valley, 
  Cal., 
  and 
  

   Mr. 
  John 
  Marten 
  of 
  Carbondale, 
  who 
  have 
  contributed 
  to 
  this 
  report; 
  to 
  

   Mr. 
  E. 
  A. 
  Schwarz, 
  who 
  has 
  constantly 
  assisted 
  in 
  office 
  work, 
  and 
  to 
  

   the 
  late 
  Albert 
  J. 
  Myer, 
  who, 
  as 
  Chief 
  Signal 
  Officer, 
  obligingly 
  fur- 
  

   nished 
  meteorological 
  data 
  whenever 
  required. 
  

  

  