CHAP. I. 



PRIMULA VULGAEIS. 



37 



TABLE 9. 

 Primula vulgaris. 



* This average is perhaps rather too low. 



this form contained, on an average, 19-2 seeds. The 

 short-styled plants produced fewer spontaneously self- 

 fertilised capsules, and fourteen of them contained only 

 6'2 seeds per capsule. The self-fertilisation of both forms 

 was probably aided by Thrips, which abounded within 

 the flowers ; but these minute insects could not have 

 placed nearly sufficient pollen on the stigmas, as the 

 spontaneously self-fertilised capsules contained much 

 fewer seeds, on an average, than those (as may be seen 

 in Table 9) which were artificially fertilised with their 

 own-form pollen. But this difference may perhaps be 

 attributed in part to the flowers in the table having 

 been fertilised with pollen from a distinct plant be- 



