Chap. VI. 



CROSS WITH A FRESH STOCK. 



213 



Table LXXXIX. 



Nicotiana tabacum. 



Plunts of the same parentage as those in Table LXXXVIIT., 

 but grown extremely crowded in two large pots. 



The twelve tallest crossed plants in the two pots belonging to 

 the two series average here 31 53, and the twelve tallest self-ferti- 

 lised plants 17 - 21 inches in height; or as 100 to 54. The plants 

 on both sides, when fully grown, some time after they had been 

 measured, were cut down close to the ground and weighed. 

 The twelve crossed plants weighed 21-25 ounces; and the 

 twelve self-fertilised plants only 7 ' 83 ounces ; or in weight as 

 100 to 37. 



The rest of the crossed and self-fertilised seeds from the two 

 parent-plants (the same as in the last experiment) was sown on 

 the 1st of July in four long parallel and separate rows in good soil 

 in the open ground ; so that the seedlings were not subjected to 

 any mutual competition. The summer was wet and unfavourable 

 for their growth. Whilst the seedlings were very small the two 

 crossed rows had a clear advantage over the two self-fertilised 

 rows. When fully grown the twenty tallest crossed plants and 

 the twenty tallest self-fertilised plants were selected and mea- 

 eured on the 11th of November to the extremities of their leaves, 

 as shown in the following table (XC). Of the twenty crossed 

 plants, twelve had flowered ; whilst of the twentv self-fertilised 

 plants, one alone had flowered. 



