ClIAP. II. 



THE COMMON OXLIP. 



65 



were crossed in the course of four seasons. I may 

 mention, as a mere curiosity, that if any one were to 

 raise hybrids between two trimorphic heterostyled 

 species, he would have to make 90 distinct unions 

 in order to ascertain their fertility in all ways ; 

 and as he would have to try at least 10 flowers in 

 each case, he would be compelled to fertilise 900 

 flowers and count their seeds. This would probably 

 exhaust the patience of the most patient man. 



TABLE 14. 

 Crosses inter se between the two forms of the common Oxlip. 



TABLE 15. 



Both forms of the Oxlip crossed with Pollen of both forms of the 

 Cowslip, P. veris. 



