142 



Dotihlcs in Stocks 



Analysis shouHu;/ the distribution of the doubles when the plants are classified 

 according to vigour, the sister seedlings in each pot culture being numbered 

 (1, 2, 3, etc.) in order of vigour. The figures show a marked decrease in 

 the proportion of doubles as we descend the scale of vigour, the number 

 being considerably in excess of expectation in the higher grades, and 

 deficient in the lower grades. The total for (dl grades together is in close 

 agreement with expectation. 



Total number of plants recorded (F.,) ... 

 Expectation on the basis of a ratio of 9D 



307 doubles 220 singles 

 7.S' 290 „ 231 



Columns 3 and 4. 



Total from the less vigorous 

 groups 



136i2 124 135J- 128 



Totals 



307 



220 



307 



220 



307 



220 307 



220 



1 A full account of the appearance and behaviour as regards surface character of this 

 form, which is new, will be given in the next issue of this Journal. 



2 Where the series to be halved was composed of an odd number of individuals 

 the middle individual was counted as half iu both groups. 



