Harris, A quantitative study of the factors influencing etc. 



9 



We pass at once to the end results - the correlations x ) 

 between the distance which a seed is from the insertion of the 

 pod (in uiiits of the interval between ovules) and the weicht of 

 the seeds. As seen in Table V, the correlations are uniformly 

 low, but all 20 are positive and the most of them may be looked 

 upon as statistically significant in comparisoD with their probable 

 errors. Biologically, this means that from the proximal end to the 

 distal end of the pod, the seeds become slightly heavier. The 

 rate of this change throughout the whole material is shown by 



Table V. 



the magnitude of the correlation coeffieient. Whether or not the 

 rate of change in weight is uniform throughout the whole 



ränge 



of proximal to distal may be tested graphically by the fitting of 

 a straight liue equation to the means of seed weight for each 

 Position. Using the conventional formula 



n v w 



W = (W— r -^- p) + r r- P, 

 where w = weight, p = position or units of distance from the 



: ) Here calculated without the application of Sheppard's correction to 

 the second nioment for seed weight. The uncorrected value is used in obtaining 

 the Standard deviations in order that r and rj, to be discussed later, may be compared. 



