THE UPWARD TRANSLOCATION OF FOODS IN WOODY PLANTS 295 
The data at hand are not adequate to settle the question as to how far 
back from the tip food is withdrawn to be used in shoot growth. In fact, 
the amount of removal probably varies with different species and with 
different individuals, depending on the conditions of the current as well as 
of previous seasons. It seems very probable, however, that there is nor- 
mally no upward movement of foods from the roots and perhaps little or 
none from the main trunk. 
Laboratory of Plant Physiology, 
Cornell University 
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