PASSAGE OF FOOD FROM LEAVES TO STEM. 17 
the eosine would travel slower in cut stems than in growing plants. 
As a matter of fact, the rate was greater in the pot plants, and in 
the experiment which has since been tried on a growing plant the 
rate was greater still. To sum up, the food current in plants is 
directed towards places where young or undifferentiated cells are 
being formed and passes along the protoplasmic lines of com- 
munication. As I have endeavoured to show, this is the exact 
course taken by the eosine, so that by injecting it into the bast 
tissue one may trace the direction taken, and also measure the 
trate of the current. 
