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U. SUZUKI. 



1. Is arginin synthetically formed from ammonium salts or 

 nitrates offered to the coniferous plants, in a similar way as 

 asparagine is formed in the other plants ? 



2. Is it also synthetically formed from ammonium salts or 

 nitrates in plants not belonging to the Coniferae ? 



3. What is the effect of light and mineral nutriments upon 

 the formation and transformation of this substance ? 



4. Is it the primary decomposition product of proteids only 

 or is it also formed from other decomposition products ? 



5. Can it be used directly for the regeneration of proteids 

 in the plant cells ? 



I. Arginin as Synthetical Product from 

 Ammonium Salts. 



■ 



The following experiments were made to settle the question 

 whether arginin can be formed synthetically from the am- 

 monium salts offered to the plants. The first three experiments 

 were made with coniferous plants and the next four with plants 

 not belonging to the Coniferae, to see whether there is any 

 difference between the two sets. 



A) CONIFEROUS PLANTS. 

 I. Pinus Thunbergii. 



Seeds of Pinus Thunbergii were sown in three wooden boxes 

 containing purified sea sand, moistened with distilled water. 

 On the 25th February they began to germinate and from that 

 time on a half saturated gypsum solution was occasionally added 

 to each box, to keep it constantly moist. On the 15th March, 

 the shoots of one box were carefully removed from the sand, 

 washed well, dried and analyzed. The other two were treated 

 with the following solutions : — 



1) Half saturated gypsum solution. 



The shoots were kept in a warm house in full day-light, the temperature varying 

 between 3o°c and I5°c. 



