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so that these problems are minimised. 
Concerning measurements of light penetration, I am quite convinced that 
every effort should be made to see that this is done. The results that I have 
obtained in connection with photosynthetic organisms associated with sea i ce 
in fact, encourage me to go further. I now firmly believe that some sort of 
FIRST FOLD HERE 
Par Avion 
Approved by Postmaster-General 
for acceptance as Aerogramme No. 2 
SECOND FOLD HERE 
ARCHER'- AEROGRAMME 
Regcf. Trade Mark 
SENDER'S NAME AND ADDRESS 
HERE 
