124 THE BOTANICAL MAGAZINE. [voi. xxii. No. 2ss. 



trinervius var. congestus and Asteromsea indica var. pinnatiHda 

 in Aomori. 



In the ^raica, on account of its single-headedness, the differ- 

 ence of flowering season, together with the meristic change of 

 rays, was determined by the external conditions, but in the 

 latter two, the internal factors seemed to have played the prin- 

 cipal role on it, and in the Aster no seasonal fall was seen in 

 the first one month. 



The series of Fibonacci hold some stability in the appearance 

 of mode, and the occurrence of variates on some classes is more 

 improbable than on other classes. 



Botanical Institute, College of Science, 

 Imperial University, Tokyo. 



March, 1908. 



