208 



U. SUZUKI. 



That is to say, Takasuke consumed 6.31 grams of reserve 

 nitrogen to develop the new stems and leaves containing 14.670 

 grams nitrogen. 



Therefore ^'^^ — 43,% of the nitrogen in the new stems and 



leaves came from the reserve materials. 



InTsuruta ^-=Z1% 

 17.992 /y) 



In Jumonji. 



It is surprising to find that the mulberry consumes a iar greater 

 quantity of reserve nitrogen than we supposed. We observe at 

 the same time that Takasuke consumes a far greater quantity of 

 reserve nitrogen than Tsuruta or Jumonji. This is especially 

 interesting, since Takasuke is more liable to suffer from the 

 disease than the other two varieties. 



Of course, the above mentioned figures represent only ap- 

 proximate values, because there are individual differences among 

 the same varieties, and absolutely exact comparisons are impos- 

 sible. Further, the reserve nitrogen does not only migrate into 

 the leaves, but a portion of it must, of course, be consumed in 

 the roots. Nevertheless, the above is sufficient to show how im- 

 portant a part the reserve materials play during the develop- 

 ment of new leaves in the mulberry. 



We shall now turn our attention ^to the question, whether 

 the new shoots that come out from the stump after cutting can be 

 sufficiently nourished with the reserve materials remaining in 

 the bark of the roots. 



At the period of cutting, the bark of the roots contained the 

 following quantities of nitrogen : — 





Takasuke 

 (May 18.) 



Tsuruta 

 (May 28.) 



Jumonji. 

 (May 28.) 



Total nitrogen 



i-73% 



'•37 



1.29 



Albuminoid nitrogen 



1. 12 



0-95 



0.95 



Non-albuminoid nitrogen 



0.61 



042 



034 



