ON THE FORMATION OF ARGININ IN CONIFEROUS PLANTS. 49 



stage of germination, but soon diminishes on further exposure to 

 light and gradually increases on further sojourn in the dark. Its 

 transformation into proteids under the influence of light can be 

 accelerated by the addition of mineral nutriments. 



5. Although the greater part of arginin in the shoots of 

 Coniferae comes from the hydrolytic decomposition of reserve 

 proteids, yet a portion of it must come also from the trans- 

 formation of other amido-compounds, that is, it is not only a 

 primary product, but also a secondary or transitory product. 



6. Arginin is probably directly used for the regeneration 

 of proteids; but its relation to other amido-compounds still 

 needs further elucidation. 



ANALYTICAL DATA. 



I. Arginin as the Assimilation product from 

 Ammonium salts. 



A). CONIFEROUS PLANTS. 

 1. Pinus Thunbergii. 



TOTAL NITROGEN. 





Dry matter 

 used. 



Baryta water 

 replaced. 



Nitrogen 

 found. 



Percentage of 

 nitrogen. 



a) 



| I- 0.433 



c.c. 

 20.6 



20.8 



| 0.0387 



8-73 



b) 



( 1. 0.480 



(2. 



18.0 

 17-5 



| 0.0331 



6.90 



c) 



f 1. 0.469 

 I 2. 



2 1 .2 



21.3 



| 0.0396 



8.45 



