206 



NICOTIANA TABACUM. 



Chap. VI. 



that the plants raised from the crossed seeds were inferior in 

 height to those from the self- fertilised seeds ; but only when not 

 greatly crowded. When crowded and thus subjected to very severe 

 competition, the crossed and self-fertilised plants were nearly 

 equal in height. 



Crossed and self-fertilised Plants of the Second Generation. 

 Twelve flowers on the crossed plants of the last generation 

 growing in the four large pots just mentioned, were crossed with 

 pollen from a crossed plant growing in one of the other pots ; 

 and twelve flowers on the self-fertilised plants were fertilised 

 with their own pollen. All these flowers of both lots pro- 

 duced fine capsules. Ten of the crossed capsules contained by 

 weight 38 - 92 grains of seeds, and ten of the self-fertilised 

 capsules 37*74 grains ; or as 100 to 97. Some of these seeds in 

 an equal state of germination were planted in pairs on the 

 opposite sides of five large pots. A good many of the crossed 

 seeds germinated before the self-fertilised, and were of course 

 rejected. The plants thus raised were measured when several 

 of them were in full flower. 



Table LXXXV. 



Nicotiana tabacum (Second Generation). 



