POSITION REGRESSION— SECONDARY BRANCHES. 



77 



Mean leaf number 



^1 OD 00 00 



b > to 



<T> 



whorls on primary 

 branches in Series I, 

 II, and III combined, 

 we find a value 



r = 0.555. 



In the case of Series 

 IV, since the primary- 

 branches (cf. table 

 30) only extend to 24 

 whorls, and the total 

 frequency beyond 

 the 18th whorl is 

 only 13, it is obvious 

 that for all practical 

 purposes the con- 

 stants given in table ^ 

 33 for the primary- ^. 

 branch correlation©' 

 are directly compar- o 

 able with those for 

 the secondaries giv- 

 en in table 38. Com- — 

 paring the primary- 

 branch values with 

 the corresponding 

 ones for secondary 

 branches in table 38 

 it is clear that apart 

 from the reduction 

 of the correlation 

 caused by the great 

 length of primary 

 branches there is 

 still a higher corre- 

 lation between leaf- 

 number and ordinal 

 position of the whorl 

 in secondary branch- . . ^, 



.... Fig. 13.— Regression of leaf-number on position in secondary-brancn 

 eStnan m primaries. whorls. series I, II, and in combined, o-. ; Series IV, 



The significance of • • 



|5 



o 



