﻿EFFECTS 
  OF 
  SOLAR 
  RADIATION 
  — 
  O'BRIEN 
  

  

  127 
  

  

  IZ 
  I 
  

  

  TIME 
  OF 
  DAY 
  

  

  Figuke 
  16. 
  — 
  Hourly 
  variation 
  of 
  solar 
  antirachitic 
  effect. 
  (2.0 
  mm. 
  zenith 
  ozone, 
  

  

  43° 
  N. 
  latitude.) 
  

  

  even 
  in 
  those 
  regions 
  of 
  the 
  spectrum 
  where 
  the 
  specific 
  absorption 
  per 
  

   unit 
  thickness 
  of 
  bacterial 
  protoplasm 
  is 
  high. 
  Thus 
  the 
  primary 
  

   photochemical 
  reaction 
  which 
  results 
  in 
  the 
  destruction 
  of 
  the 
  organ- 
  

   ism 
  may 
  occur 
  anywhere 
  within 
  the 
  bacterial 
  cell, 
  and 
  very 
  possibly 
  

   within 
  some 
  components 
  of 
  the 
  cell 
  nucleus. 
  

  

  VARIATION 
  OF 
  ANTIRACHITIC 
  EFFICIENCY 
  

   WITH 
  TIME 
  OF 
  DAY 
  

  

  2.ftmm 
  OZONE 
  

  

  ayn.ua. 
  

  

  •JUNE 
  I 
  AND 
  JULY 
  10 
  

   WAY 
  I 
  AND 
  AU&. 
  12 
  

   APR. 
  15 
  AND 
  AUS.Z9 
  

   APR 
  I 
  AND 
  SEPT 
  IZ 
  

   Aft 
  15 
  AND 
  SEPTJ7 
  

   MAR. 
  I 
  AND 
  OCT. 
  IZ 
  

   FEB. 
  15 
  AND 
  OCT. 
  ZS 
  

   FE3 
  I 
  AND 
  NOV 
  II 
  

   JAN 
  I 
  AND 
  OEC.I2 
  

  

  8 
  

  

  10 
  

  

  TIME 
  OF 
  DAY 
  

  

  Figube 
  17. 
  — 
  Hourly 
  variation 
  of 
  solar 
  antirachitic 
  effect. 
  (2.8 
  mm. 
  zenith 
  ozone, 
  

  

  33° 
  N. 
  latitude.) 
  

  

  