﻿426 
  DEDUCTIONS 
  FROM, 
  AND 
  OBSERVATIONS 
  ON, 
  ETC. 
  

  

  of 
  Amboy 
  a 
  violent 
  S. 
  W. 
  wind 
  and 
  very 
  black 
  clouds 
  coming 
  from 
  

   the 
  N. 
  E., 
  mingled 
  with 
  a 
  bright 
  silvery 
  light, 
  and 
  most 
  vivid 
  light- 
  

   ning 
  without 
  thunder. 
  The 
  wind 
  below 
  changed 
  about 
  daylight 
  to 
  

   the 
  N. 
  E., 
  and 
  blew 
  violently 
  very 
  cold 
  for 
  some 
  hours, 
  and 
  then 
  

   again 
  resumed 
  its 
  old 
  course, 
  S. 
  W., 
  on 
  the 
  afternoon 
  of 
  the 
  20th. 
  

  

  On 
  this 
  same 
  morning, 
  the 
  20th, 
  a 
  most 
  violent 
  N. 
  E. 
  gale 
  was 
  

   experienced 
  at 
  Quebec. 
  

  

  Two 
  conclusions, 
  which 
  promise 
  to 
  be 
  of 
  immense 
  value 
  in 
  meteor- 
  

   ology, 
  are 
  clearly 
  deducible 
  from 
  the 
  facts 
  here 
  established. 
  

  

  1. 
  There 
  was 
  an 
  inward 
  motion 
  of 
  the 
  air 
  in 
  atl 
  directions 
  towards 
  

   the 
  centre 
  of 
  the 
  spout 
  below, 
  and 
  upward 
  motion 
  in 
  the 
  middle.* 
  

  

  2. 
  The 
  hail 
  was 
  formed 
  by 
  the 
  congelation 
  of 
  drops 
  of 
  rain 
  gene- 
  

   rated 
  at 
  and 
  over 
  the 
  place 
  where 
  the 
  shingles 
  were 
  taken 
  up. 
  

  

  The 
  cause 
  of 
  this 
  upward 
  motion 
  in 
  the 
  spout 
  is 
  the 
  great 
  expansion 
  of 
  the 
  air 
  from 
  the 
  

   evolution 
  of 
  latent 
  caloric, 
  when 
  the 
  vapour 
  in 
  the 
  spout 
  changes 
  to 
  water 
  ; 
  the 
  expansion 
  of 
  

   the 
  air 
  by 
  the 
  liberated 
  caloric 
  being 
  about 
  six 
  times 
  greater 
  than 
  when 
  combined 
  with 
  water 
  

   in 
  the 
  form 
  of 
  vapour, 
  as 
  has 
  been 
  fully 
  explained 
  in 
  a 
  paper 
  now 
  preparing 
  for 
  insertion 
  in 
  

   the 
  Transactions 
  of 
  this 
  Society. 
  

  

  