Bull, Agric. Coll. Vol. IV. PI. V. 



This plate shows the influence of light upon the change of nitrogenous compounds 

 in the shoots of Pinus I hunbergii. The shoots were kept for 14 days in perfect darkness 

 and a portion was afterwards, exposed to the day-light for 14 days, while the other 

 portion was still kept in the dark. The black lines refer to shoots kept in the dark 

 until the end of the experiment, and the red lines to those, previously kept in the dark, 

 and afterwards exposed to the full day-light for 14 days. 



