R T. P. BaRKKU AM) (\ T. (JlMINGHAM 11 



When the leaves were fairly well developed, the plants were uncovered 

 and the following series of experiments was carried out : 



Plant No. 1. Leaves covered with ordinary Bordeaux mixture 

 {i.e. containing large excess of lime). 



Phinl No. 2. Leaves first artificially damaged with scratches and 

 pin-})rit'ks and then treated as No. L 



Fig. 3. Foliage damaged with scratches and cuts and treated with "no-excess-lime" 



Bordeaux mixture. 

 Fig. 4. Foliage damaged with pin-pricks and treated with ordinary Bordeaux mixture. 



Plant No. 3. Leaves covered with " no-excess-lime " Bordeaux 

 mixture^. 



Plant No. 4. Damaged exactly as No. 2, and the leaves then covered 

 with the " no-excess-lime " mixture. 



' This expression is used to indicate a mixture of copper sulphate and lime water 

 in such proportions that the whole of the copper is precipitated in the form of the basic 

 sulphate 10 CuO. SO.. (Pickering). 



