THE BIOLOGY OF PLAXT GROWTH 451 



bosomal particle. What is the nature of this control? Arc there genes 

 responsible for the exercise of such control? Are there genes which 

 contain information concerning the programming of the information? 

 We do not know, but now that the question has been posed, we can 

 find out. We can learn, too, to read the message of the DNA, and as we 

 learn to read the message contained within the genetic material, and 

 learn how the reading of the message is programmed by the cell and 

 translated into action, we will come to understand on a truly funda- 

 mental level the central features of the biology of plant growth. 



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