14 



Art. 5.— Y. Toda: 



Table III., B. 

 Intensity of Light and relative " Lichtgenuss." 



3) To ascertain whether the above result was constant, I 

 observed the intensity of light by the culture of the moss on a 

 whole brick (page 10) on three different parts of it. 



A. At the edge of the brick. 



B. At 11-^ cm. from the edge. 



C. At 16— cm. from the edge. 



Between 1— cm. and 9 cm. from the edge, the shoots grew 

 well; between 6-^ cm. and 11 2" cm. the protonemata grew well 

 and gave out their peculiar light. From 16-^ cm. on, where the 

 intensity of light was below 0.0006 and the " Lichtgenuss " less 

 than -^7^ , the moss, and indeed the protonemata, could not even 

 continue their growth. Thus the proper intensity of light seems 



