P>. 'I'. I'. liAKKKK AND C T. (ilMINCHAM 21 



solvent action on the particles of the copper compounds with which 

 they may come into contact. There is rapid absorption of the dissolved 

 copper followed by death of the cells. In the case of injured foliajje 

 such action results in scorching. 



(2) The amount of inter-action, if any, between other types of cells 

 and the copper compounds is deternuned by the nature of the cell wall. 

 Direct absorption of copper by leaves of certain types takes place with 

 or without local injury, depending on the nature of the leaf surface. 

 Translocation of the absorbed copper to other parts of the plant may 

 follow. 



(3) Copper may be absorbed through the roots of certain plants 

 (potatoes, beans), with local injury to the root. This absorbed copper 

 can be translocated to the aerial parts of the plants without injury to 

 the cells through which it passes. 



