IO 



J. ARTHUR HARRIS. 



TABLE II. 



CORRELATION BETWEEN NUMBER OF STAMENS AND PISTILS IN Ficaria AND RE- 

 GRESSION EQUATIONS FOR STAMENS AND PISTILS. 



mean number of stamens associated with an increase in number 

 of pistils per flower. 



The regression of the number of stamens on the number of 

 pistils and of the number of pistils on the number of stamens is 

 shown for three of the larger series in Figs. 1-3. 



The empirical means for the Italian series, Diagram I, do not 

 conform very satisfactorily to the lines given by the equations. 

 Better agreements between actual and theoretical means could 

 hardly be found (in series of data no larger than these) than in 

 the Guernsey and Surrey series represented in Figs. 2 and 3. 



The main purpose of the present paper is to present the results 

 of the determination of the relationship between the total 

 number of sporophylls and the number of stamens and pistils. 



The correlations between the total number of sporophylls and 

 the number of stamens and pistils are shown in Table III. 



As is to be expected the correlations between total sporophylls 

 and number of stamens and pistils are high. 



The constants showing the relationship between the total 

 number of sporophylls and the deviation of the number of 



