214 



U. SUZUKI. 



Date of cutting. 



Number ot 

 cutting. 



Number of 

 plants. 



Healthy. 



Tartly 



diseased. 



May 16. 



1 



28 



26 







1 



1 1 



II 





" 



1 



1 1 



1 1 





June i 



1 



20 



20 







1 





1 1 







1 



1 1 



1 1 





„ 20 



1 



20 



14 







1 



1 1 



9 





Diseased, 



The same experiment was repeated in 1899 with the same 

 variety in the same farm : — 



Date of cutting. 



Number of 

 cuttings. 



Number of 

 plants. 



Healthy. 



1 )iseased. 



June 1 



1 



20 



16 



4 



June 20 



1 



20 



13 



7 





1 







8 



Total 





51 



32 



19 



Percentage ... 





100 



63 



37 



The control plants all remained healthy. 



Hence it is quite evident that the cutting is the principal 



cause of the disease. 



(II). If my assumption be true, then the disease must be in- 

 duced in health)' plants by simply picking off the leaves after 

 their full expansion, as by this means the reserve materials in 

 the roots and stems must as well become exhausted. Following 

 is the result of such an experiment. 



