CHAP. VT. CROSSED AND SELF-FERTILISED PLANTS. 207 



The thirteen crossed plants here average 39 '35, and the 

 thirteen self- fertilised plants 31*82 inches in height; or as 100 

 to 81. But it would be a very much fairer plan to exclude all 

 the starved plants of only 10 inches and under in height ; and 

 in this case the nine remaining crossed plants average 53 '84, 

 and the seven remaining self-fertilised plants 51 '78 inches in 

 height, or as 100 to 96 ; and this difference is so small that the 

 crossed and self-fertilised plants may be considered as of equal 

 heights. 



In addition to these plants, three crossed plants were planted 

 separately in three large pots, and three self-fertilised plants in 

 three other large pots, so that they were not exposed to any 

 competition; and now the self-fertilised plants exceeded the 

 crossed in height by a little, for the three crossed averaged 55 '91, 

 and the three self-fertilised 59'16 inches; or as 100 to 106. 



Crossed and self-fertilised Plants of the Third Generation. As I 

 wished to ascertain, firstly, whether those self-fertilised plants of 

 the last generation, which greatly exceeded in height their crossed 

 opponents, would transmit the same tendency. to their offspring, 

 and secondly, whether they possessed the same sexual constitu- 

 tion, I selected for experiment the two self-fertilised plants 

 marked A and B in Pot III. in Table LXXXV., as these two 



TABLE LXXXVI. 



Nicotiana tabacum (Third Generation). 



Seedlings from the Self -fertilised Plant A in Pot III., 



Table LXXXV., of the last or Second Generation. 



