16 Harris . Observations on the Physiology of Seed Development in Sfaphylea. 



depeudent upon either position on the inflorescence or number of 

 fruits developing per inflorescence. There is a slight negative 

 correlation for number of fruits and number of seeds developing, 

 but Position on the inflorescence seems to have no sensible in- 

 fluence on the capacity of the fruit for maturing its seeds. 



4. The results set forth here, taken in connection with others 

 to which reference has been made, show that fertility and fe- 

 cundity are not always so easily influenced by the character of 

 the inflorescence or by the position of the fruit on the inflorescence 

 as might have been a priori expected. Only where we have 

 large and diverse series of quantitative data for comparative study 

 shall we be able to speak in general terms of the factors under- 

 lying the development of the ovules of an ovary into seeds. 



