The study of plant physics is still in its swaddling clothes, but in many parts of 
the world research work is in progress, which, when completed, may revolutionise 
many of our present ideas and methods. Every grower can contribute his share to 
this quest for knowledge by making careful experiments and recording the re- 
sults. Even if an experiment fails in its object, it may yet reveal some import- 
ant factor hitherto unrecognised. 
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