12 Harris , Observations on the Physiology of Seed Development in Staphylea, 



danger line of chance errors to attribute much biological significance 

 to our results. 



Approaching" the same problem from another siele, we examine 

 the correlation constants for position and number of ovules failing 

 to develop into seeds for the twenty individuals of the 1906 series. 

 They appear in Table 2. 



These constants for Vpf are equally divided between positive 

 and negative. Only three deviate frome more than - . 100, and these 

 only slightly. The averago for the series is — . 0183 + . 0109. 

 Obviously no significance whatever is to be attached to this value, 

 and we must conclude that there is no evidence that the position 

 of a fruit on its inflorescence has anything to do with the failure 

 of ovules to develop into seeds. 



Table 2. 





Tps 



••pf 



Shrub. 



Position of Fruit 



Position of Fruit 





and Number of 



and Number of 





Seeds. 



Ovules Failing. 



11 



-.084 



.026 



12 



-.088 



—.040 



13 



-.128 



-.082 



14 



—.048 



.041 



15 



-.006 



.093 



16 



-.058 



—.108 



17 



—.018 



.013 



18 



.091 



—.090 



19 



.064 



.079 



20 



.063 



—.165 



21 



—.097 



—.000 



22 



.005 



-.046 



23 



.018 



.013 



24 



-.006 



—.027 



25 



-.009 



.026 



26 



—.070 



—.092 



27 



-.126 



—.146 



28 



—.025 



.068 



29 



—.017 



.036 



30 



—.079 



.033 



For fps for the three general saiuples, we have: 



1906, Table X, r = — . 0148 + . 0086. 



1908, Table XI, y == — . 0077 £ . 0061. 



1909, Table XII, /• = + . 0128 ± . 0085. 



How slender these relationships really are, may be best Seen 

 by expressing them in terms of regression. We have for the three 

 straight line equations for position and number of seeds: 



1906, s = . 7426 — . 0167 j). 



1908, s = . 8866 — . 0098 ^j. 



1909, .s' = . 7384 + . 0159 2j. 



