Apk. 1912.] 



H. NAKANO.— VARIATION IN THE SEEDS AND PULP. 



85' 



The variation of seeds and their Correlation 

 to the vesicles. 



The formation of seeds, especially of embryos, is in some 

 waj' to the fertilization phenomena. (Although Max. Biermann 

 once observed apogaraous poh'embrj^os in Citrus vulgaris, Riss.,^) 

 he could not find parthenogenetic seeds there.) 



On the other hand, some citrus species are characterised by 

 their parthenocarpy. The calculation of the number of seeds 

 can therefore give us an idea of the degree of fertilit}-. The 

 degree of fertility seems to be correlated with the number of 

 pulp-vesicles in well-fertilized mandarins, while it is doubtful in 

 parthenocarpic ones. 



From the foregoing points it is clear that the usefulness of 

 studying the degree of correlation between the number of the 

 seeds and of the vesicles cannot be over-estimated. 



In fruits having a few seeds, the counting of the seeds was 

 easily done by dissecting them into two halves. In many-seeded 

 ones, it was done by the pulp-vesicles being dissected one by 

 one. The small stunted seeds (if we may say so,) which were 

 of a reddish-yellow colour or transparent, were omitted, and 

 the green-coloured seeds only were taken into account. First I 



1) Beitrage znr Kenntnis der Entwickelungsgescliiclite der Frilclite von Citrus 

 lulgaris und andeier Citrusarten. 1896 p. 44. Dissertation. 



