Apk. 1012.] H. NAKANO— VARIATION IN THE SEEDS AND PULP. 



89 



Now let us imagine the relationship between four kinds of 

 mandarins. From the general law of hybrids we think that a 

 well-fertilized plant is closer to the stock plant than a poorly 

 fertilized one. From this point of view Kishumikan and Koji- 

 mikan seem to have a nearer kinship to the mother plant, than 

 the other two. Peculier as it is, it seems to me, that Kojimikan 

 is the original and Fukuremikan is its variety, because the degree 

 of fertility is larger in the former than in the latter. This point 

 wants a further investigation. 



In conclusion I wish to express my hearty thanks to Prof. 

 MiYosHi and Mr. T. Making for their valuable suggestions. 

 Also I must express my sincere thanks to Mr. R. Aylmer Coates 

 who has helped me with much favor for correcting my English. 



Dec. 1911. Bot. Institute, 



Imp. Univ. Tokyo. 



Summaries. 



From all the results above mentioned, the following sum- 

 maries may be deduced. 



1. The variation in the number of pulp-vesicles in the four 

 races of Citrus Aurantiun L. Subsp. nohilis Mak. var. Tachi- 

 hana Mak. shows a monomodal curve and the mode is held 

 on 9, 10 or 11. 



The variation in the seeds of poorly fertilized mandarins 

 gives a strongly skew curve, even a half Galton-curve, while 

 well-fertilized ones, show a symmetrical curve. 

 On the point of number of seeds and vesicles, Fukuremikan 

 and Uushumikan are very nearly allied. Kishumikan is 

 slightly distinguishable from the above two by the number 

 of vesicles, while in the same point Kojimikan is dearly dif- 

 ferent from other mandarins. The difference of the four kinds 

 of mandarins is more pronounced in the number of seeds 

 than in that of vesicles. 



2. As far as my observations go, the local variation of vesicles 

 IS not so great as to cause its mode to change its position 

 and it is very like the annual variation in the same tree. It 



