U. SUZUKI. 





Healthy. 



Diseased. 



Ratio. 



Nitrogen-free extracts 



32.08 



55 CC 



100 : 



104.6 



Ash (free from carbon and 









sand) 



6.92 



7 IQ 



100 : 



103.9 



Total nitrogen 



2.l6 



2.47 



100 : 



1 14.2 



Albuminoid nitrogen 



1.02 



1. 19 



100 : 



1 17.0 



Non-albuminoid nitrogen 



1. 14 



1.28 



100 : 



112. 3 



In 100 parts of ash (free from 



carbon and 



sand), 





Si0 2 



1. 14 



2. 12 



100 : 



186.0 



S0 3 



3-40 



4.48 



100 : 



132.0 



P 2 0 5 



9.86 



12.07 



100 : 



123.0 



K 2 0 



34.85 



32.59 



100 : 



93-5 



CaO 



21.23 



23-30 



100 : 



1 10.0 



MgO 



1 1.60 



13.90 



100 : 



126.0 



We see from the above tables that the average length of the 

 diseased stems is nearly half that of the healthy ones, and the 

 fresh weight nearly -\. Both the diseased stems and leaves con- 

 tain a little less moisture, but the difference is not so remarkable, 

 being only 2% in the stems and in the leaves. The total 

 dry weight of the leaves of one diseased stem is about \ of those of 

 a healthy one, while the average dry weight of one diseased leaf is 

 far less than that of a healthy one, being only \ of the latter. 



Comparing the chemical constituents of the leaves, we find 

 that nitrogen compounds, fibres, and fats are remarkably deficient 

 in the diseased ones, being nearly f of the healthy, while, on the 

 contrary, nitrogen-free extracts are more abundant. The reason 

 why the leaves remain so small and shrivel may be due to the 

 deficiency of nitrogen compounds in the living cells, in conse- 

 quence of which the chemical activity of the living protoplasm 

 must be much retarded, and also to the bad development of 

 fibres. The assimilation products in the leaves remain unchang- 

 ed, and the conversion by the living protoplasm, of soluble 

 sugars into cellulose seems to be especially retarded. 



It is a most remarkable fact that the diseased leaves con- 

 tain only § of the non-albuminoid nitrogen compounds, compared 

 with the healthy ones. The decrease of non-albuminoid nitrogen 



