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U. SUZUKI. 



sumption of reserve nitrogen for the development of new 

 leaves, not an inconsiderable amount of nitrogen was, 

 still afterwards, transported from the stems and roots to the 

 leaves. That is to say, on April 28, the bark of the 

 roots still contained 2.56% and that of the stems 2.74°^ of 

 nitrogen ; this, however, gradually decreased, and on May 

 18, we found only 1.7$% in the bark of the roots and 1.91% 

 in that of the stems. As the dry matter of the bark of 

 the roots was nearly 250 grams and that of the stems 

 140 grams, we can calculate the total amount of the nitrogen 

 transported after April 28 ; thus : — 



250 x (2.56— i.73) = 250 x 0.83% = 2.07$ grams 



transported from the roots 

 140 x (2.74— 1.91)= 140x0.83^= 1. 162 grams 



transported from the stems. 



Sum total = 3.237 grams. 



If now we add the nitrogen consumed before April 28, then 

 we have : — - 



3. 237 i- 3.072 = 6.31 grams nitrogen, transported during 

 the development of the leaves, of which nearly 4.15 grams 

 was in the roots. 



B) Tsuruta. 



On April 28, new leaves contained 



already 2.79 gram. 



After the 28th. transported from the roots 2.34 



,, from the stems 0.52 



Sum total 5.65 grams nitrogen 



Nearly 4.26 grams therefore was in the roots. 



C) Jumonji. 



On April 28, the new leaves contained. . 1.45 grams. 



After the 28th. transported from the roots 1.50 



,, ., ,, from the stems 1.00 



Sum total 3.95 grams nitrogen. 



Of this nearly 2.60 grams was in the roots. 



