90 THE BOTANICAL MAGAZINE. [Voi. xxvi. x... 304. 



may therefore be conceded that the number of vesicles is of 

 an almost stationary' character. 



3. The greater average weight in the fruit of the upper part of 

 the Fukuremikan tree is not always correlative with the 

 greater average number of vesicles. The correlation-table 

 between the weight of the fruit and the number of vesicles 

 clearly shows that they are not correlated in a remarkable 

 degree, and so the above result is obtained. 



4. The correlation between the number of seeds and of vesicles 

 can be well observed in well-fertilized mandarins, but in 

 poorly-fertilized ones it is not great; for instance, in Fukure- 

 mikan a negative correlation may be observed in part of the 

 correlation-table and hence the correlation-coefficient is very 

 small. 



EXPLANATION OF PLATE IL 



Fig. 1. Variation of the pulp-vesicles o( Fukuremikan. 



1909 A Variation of 1909 in A luibitat. 



1909 B ,, „ „ in B 



1910 C „ „ 1910 in C 



&c. 



Fig. 2. Variations of the pulp-vesicles in the four kinds of mandarins. 



The line for Fukuremikan. 



,, ,, Unshumikan. 



,, ,, Kojimikan. 



^^ ^^ Kishumikan. 



Fisf. 3. Variation of the seeds o^" the four kinds of mandarins. 

 The symbols are the same as in Fig. 2. 



'e>' 



