Growth and variation in maize. 



145 



13. 

 A. 



deviation of each plant in Series A arranged accord- 

 quintile classes. 



tile classes. 



deviation in such a case is zero. In a number of cases all fourteen of 

 the measurements of a plant fall in two contiguous quintiles in which 

 case the standard deviation cannot be greater than 0-5 of a quintile. 

 The largest standard deviation that could be obtained would be given 

 by a distribution in which seven observations fall in quintile I and 

 seven in quintile V. The standard deviation would then be 2-0. As a 

 matter of fact no plant gave a distribution even approaching tliis form. 

 There are no standard deviations greater than 1-55 (cf. tables 13 — 15) 

 which means that the measurements of such a plant were but little 

 more widely scattered than if they had been equally distributed in all 

 five quintiles. 



Induktive ÄbstammungB- und Vererbungslehre. XIV. 1() 



