CHAP. V. HETEROSTYLED DIMORPHIC PLANTS. 217 



seeds, with a maximum of 35. Such a union in the case 

 of a legitimate plant ought to have yielded an average 

 of 64 seeds, with a possible maximum of 73 seeds. 



Summary on the Transmission of Form, Constitu- 

 tion, and Fertility of the Illegitimate Offspring of Pri- 

 mula Sinensis. In regard to the long-styled plants, 

 their illegitimate offspring, of which fifty-two were 

 raised in the course of two generations, were all long- 

 styled.* These plants grew vigorously; but the flowers 

 in one instance were small, appearing as if they had 

 reverted to the wild state. In the first illegitimate 

 generation they were perfectly fertile, and in the second 

 their fertility was only very slightly impaired. With 

 respect to the short-styled plants, twenty-four out of 

 twenty-five of their illegitimate offspring were short- 

 styled. They were dwarfed in stature, and one lot of 

 grandchildren had so poor a constitution that four out 

 of six plants perished before flowering. The two sur- 

 vivors, when illegitimately fertilised with their own- 

 form pollen, were rather less fertile than they ought 

 to have been; but their loss of fertility was clearly 

 shown in a special and unexpected manner, namely, 

 when legitimately fertilised by other illegitimate 

 plants: thus altogether eighteen flowers were fertilised 

 in this manner, and yielded twelve capsules, which 

 included on an average only 28.5 seeds, with a 

 maximum of 45. Now, a legitimate short-styled plant 

 would have yielded, when legitimately fertilised, an 

 average of 64 seeds, with a possible maximum of 74. 

 This particular kind of infertility will perhaps be best 

 appreciated by a simile: we may assume that with 



* Dr. Hildebrand, who first short-styled. From a short-styled 



called attention to this suhject plant illegitimately fertilised with 



(' Bot. Zeitung,' 1864, p. 5), raised its own pollon he raised fourteen 



from a similar illegitimate union plants, of which eleven were short- 



seventeen plants, of which four- styled and three long-styled, 

 teen were long-styled and three 

 16 



