274 



U. SUZUKI. 



in the healthy leaves is remarkably rapid ; thus, I have very 

 often observed in October that in rainy or cloudy weather or 

 even in the evening shortly after the sun had set, starch was 

 no longer visible, and only in fine weather when the leaves were 

 exposed to strong sun light, the accumulation of starch in the 

 leaves was plainly observed. The following table also shows 

 very marked differences between healthy and diseased leaves : 



Average composition of healthy and diseased 

 leaves (15 samples). 

 In 100 parts of dry matter : 



Diseased. 

 25.76 

 3-8o 

 8.14 



Ratio. 



Crude protein 31-47 25.76 100:81.8 



Crude fat 4.42 3.80 100 : 86.0 



Crude fibre 10.00 8.14 100 : 81.4 



Other compounds, chiefly starch 47-97 57-6o 100 : 120.0 



Crude ash 8.52 7.75 100 : 91.0 



We see from this table that the starch content is 

 markedly increased in the diseased leaves. I have also 

 repeated the experiment of Prof. Miyoshi ; 0.1—0.2 grams of 

 dried and pulverized leaves were boiled for a few minutes with 

 10 c.c. water to pastify the starch. Upon addition of a few 

 drops of iodine tincture, the following results were obtained. 



Starch content. 

 I lealthy. Diseased. 



Oct. 2 

 „ 6 



27. 



Roso 



Jumonji 



Akagi 

 Morning 6 o'clock, 

 Noon 12 „ 

 Evening 6 ,, 



Icliihei 



Nezumigayeshi 



Takasuke 



Akagi 



Yanagita 

 Jumor.ji 

 Shimanouchi 

 Tsuruta 

 Roso 



None 



much 

 Almost none 



none 

 very little 

 Almost none 

 none 



Much 



• gathered 10 a.m. cloudy day. 



was repeated with several other 

 same result. I tried to see how 

 long it would take to use up the starch deposited in the 

 diseased leaves when kept in the dark, the assimilation process 



The same experiment 

 samples, always with the 



