214 



NICOTIAN A TABACUM. 



CHAP. VI. 



TABLE XC. 

 Nicotiana tabacum. 



Plants raised from the same seeds as in the last two experiments, 



but sown separately in the open ground, so as not to compete 



together. 



The twenty tallest crossed plants here average 48 '74, and the 

 twenty tallest self-fertilised 35 '2 inches in height; or as 100 to 

 72. These plants after being measured were cut down close to 

 the ground, and the twenty crossed plants weighed 195-75 

 ounces, and the twenty self-fertilised plants 123 25 ounces ; or 

 as 100 to 63. 



In the three preceding tables, LXXXVIIL, LXXXIX., and 

 XC., we have the measurements of fifty-six plants derived from 

 two plants of the third self-fertilised generation crossed with 

 pollen from a fresh stock, and of fifty-six plants of the fourth self- 

 fertilised generation derived from the same two plants. These 

 crossed and self-fertilised plants were treated in three different 

 ways, having been put, firstly, into moderately close competition 

 with one another in pots ; secondly, having been subjected to 

 unfavourable conditions and to very severe competition from 

 being greatly crowded in two large pots ; and thirdly, having 

 being sown separately in open and good ground, so as not to 

 snffer from any mutual competition. In all these cases the 

 crossed plants in each lot were greatly superior to the self- 



