r-HAP. V. HETEEOSTYLED DIMOEPHIC PLANTS. 213 



mately with pollen from the same form, the seedlings appear to 

 belong invariably to this form. Thus Hildebrand states * that 

 long- styled plants of 0. rosea growing by themselves have been 

 propagated in Germany year after year by seed, and have always 

 produced long-styled plants. Again, 17 seedlings were raised 

 from mid-styled plants of 0. hedysaroides growing by themselves, 

 and these were all mid-styled. So that the forms of Oxalis, 

 when illegitimately fertilised wth their own pollen, behave like 

 the long-styled form of Lythrum salicaria, which when thus fer- 

 tilised always produced with me long-styled offspring. 



Primula. 



Peimula Sinensis. 



I raised during February 1862, from some long- 

 styled plants illegitimately fertilised with pollen from 

 the same form, twenty-seven seedlings. These were 

 all long-styled. They proved fully fertile or even 

 fertile in excess ; for ten flowers, fertilised with pollen 

 from other plants of the same lot, yielded nine cap- 

 sules, containing on an average 39 '75 seeds, with a 

 maximum in one capsule of 66 seeds. Tour other 

 flowers legitimately crossed with pollen from a legiti- 

 mate plant, and four flowers on the latter crossed with 

 pollen from the illegitimate seedlings, yielded seven 

 capsules with an average of 53 seeds, with a maximum 

 of 72. I must here state that I have found some 

 difficulty in estimating the normal standard of fer- 

 tility for the several unions of this species, as the 

 results differ much during successive years, and 

 the seeds vary so greatly in size that it is hard to 



* 'XJcber den Trimorpliismus zu Berlin,' 21st June 186G, p. .S73; 

 in der Gattuiig Oxalis: Monats- and 'Bot. Zuilung, 1871, p. 435. 

 Deriohto dcr Akad. der AVissen. 



