194 



Clyde E. Leighty 



Series 102 



i-( <M CO 



J. I I 



O i-H oq 



C5 O ^ 



X C2 o 



Totals 19 54 60 49 39 25 26 12 9 5 1 1 



Totals 



0-1 



19 



39 



5 

















63 



1-2 





15 



51 



11 



1 













78 



2-3 







4 



37 



17 







1 







59 



3-4 









1 



19 



14 



6 









40 



4-5 











2 



11 



13 







1 





32 



5-6 















6 



4 



1 



1 1 



18 



6-7 















1 



2 



7 



4 



14 



7-8 



























8-9 





















1 



1 



300 



Fig. 173. — Correlation between average yield of culm per plant, in 

 decigrams, subject; and average weight of straw per culm of plant, 

 in decigrams, relative 



r= .944 ± .004 



is increased to a small extent when plants are grown in more crowded 

 conditions up to a certain limit, beyond which the correlation is again 

 reduced. 



Series 118 



i-< <M CO 



6 



^ 



(M 



CO 



^ 



iC 



o 



i> 



60 



84 

 25 



8 



48 



7 



1 

 13 



28 



5 

 10 



3 



4 



2 

 1 



1 



0-1 

 1-2 

 2-3 

 3-4 

 4-5 

 5-6 



Totals 60 109 63 42 15 7 3 1 



Totals 



153 

 86 

 40 

 15 



5 



1 



300 



Fig. 174. — Correlation between average yield of culm 

 per plant, in decigrams, subject; and average weight 

 of straw per culm, of plant, in decigrams, relative 

 r= .888± .008 



Interesting conditions are found when diameter of straw is correlated 

 with breaking strength of straw (Figs. 175 to 180). The highest cor- 

 relation in line 50 is in the most crowded condition, where the coefficient 



