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This plate shows the increase of organic bases, especially arginin, in the shoots 

 of Pinus Thunbergii by the addition of ammonium salts. The black lines refer to shoots 

 cultured in the half saturated gypsum solution, in the diffused day-light, and the red 

 lines refer to those cultured in 0.5% ammonium chloride solution, half saturated with 

 gypsum, in the diffused day-light. 



