144 



Pearl und Surface. 



Table 



Series 



Showing the mean quintile position and standard 



ing to mean 



Mean quin- 



ments, and the square roots were taken with sufficient accuracy from 

 Baelow's tables. 



The mean quintile position of an individual plant gives a measure 

 of its relative size for the whole season. Thus a plant that has tend- 

 ed to remain small throughout the season will have most of its mea- 

 surements in or about quintile I and consequently its mean quintile 

 position will approach TO. Those which have tended to remain large 

 will liave a value near 5-0. 



The standard deviation of these means measures the scatter of 

 the observations. Thus for example there are a few cases in which 

 all the measurements of a plant fall in one (luintile. The standard 



