MULBERRY-DWARF TROUBLES IN JAPAN. 277 



b). Oct. 11, Leaves from another variety served for a 

 similar experiment. 



Control (a) ; Leaves 14 days in darkness (b). 

 Nezumigayeshi (I). 



Healthy. Diseased. 





(a) 



(i) 



(a) 





Number of leaves 



25 



2 5 



2S 



25 



Dry weight of one leaf 



0.78 



0.552 



O.46 



0.381 



Ratio of dry matter in one leaf 



100.0 



70.8 



100.0 



82.8 



Total nitrogen 



4.64 



4.92 



4.04 



4-39 



Total nitrogen in one leaf 



0.0362 



0.02706 



0.01855 



0 01678 



Ratio of total nitrogen in one leaf 



100.0 



75-i 



ioo.o 



90.0 



Decrease of nitrogen during li days ;' Healthy 100 : Diseased 40.1. 



Nezumigayeshi (2). Kept in dark 11—25. 



Healthy. Diseased. 





Oct. 11 



Oct. 25 



Oct. 11 



Oct. 25 



Number of leaves 



30 



30 



30 



30 



Dry weight of one leaf 



0.81 



0 637 



0.32 



0.29 



Ratio of dry matter in one leaf.. 



100.0 



78.7 



100.0 



90.5 



Total nitrogen ... 



4-53 



4.78 



3-6i 



3.76 



Total nitrogen in one leaf 



0.0362 



0.03014 



0.01155 



0.01090 



Ratio of total nitrogen in one leaf 



100.0 



83.0 



ICO.O 



94-3 



Decrease of nitrogen during 14 days ; Healthy 100: Diseased 33.5. 



c). Ogon. Kept normal, not in the dark. 11—25. 



Healthy. Diseased. 





Oct. 11 



Oct. 25 



Oct. 11 



Oct. 25 



Number of leaves 



30 



30 



30 



30 



Dry weight of one leaf 



0.83 



0.60 



030 



0.26 



Ratio of dry matter in one leaf.. 



100.0 



72.2 



100.0 



81.8 



Total nitrogen . 



403 



4.05 



3 3 2 



gig 



Total nitrogen in one leaf 



0003345 



0.00243 



0 00106 



0.001004 



Ratio of total nitrogen in one leaf 



100.0 



72.6 



100.0 



95.2 



Decrease of nitrogen during 14 days ; Healthy 100 : Diseased 27.6. 



