Harris, Correlation in the Inflorescence of Sanguinaria. 



629 



sichtlich des Inhaltes ist dagegen ,,Ergologie" ein besserer Name 

 als ,,Okologie" (im weiten Sinne) fur eine Wissenschaft, die so 

 vielerlei Lebensvorgange, Einrichtungen, Anpassungen und sonstige 

 Leistungen der Pflanzen erforschen und darstellen soil. 



Correlation in the Inflorescence of Sanguinaria. 



By ,T. Arthur Harris. 



The subject of correlation has received considerable attention 

 from botanists. Goebel 1 ) was a pioneer in the consideration of 

 these problems, and nearly ten years ago De Vries 2 ) named corre- 

 lation as one of the most important problems in future evolutio- 

 nary work, and emphasized the necessity for the use of quantitative 

 methods. 



The purpose of this note is to state in non-technical terms the 

 results of a biometric study of the inflorescence of the Blood Root, 

 Sanguinaria Canadensis. The data for two series, of 1000 and 

 400 inflorescences, are presented and analyzed in detail elsewhere 3 ) 

 and here only the chief points will be touched upon. 



In Sanguinaria, a monotypic genus of the Papaveraceae, the 

 fruit is borne on a slender pedicel sent up from the root-stalk. It 

 is one-celled with two parietal placentae upon which the ovules 

 are arranged in two or more irregular rows. 



Diagram of upper portion of inflorescence. The fruit is opened on one side, showing 

 the two placentae with the matured seeds and the abortive ovules. 



Our problem is to measure the degree of interdependence of 

 the several parts or characters of the inflorescence. The relationships 

 we shall record in terms of the coefficient of correlation. 



1) Goebel, K. Organographie der Pflanzen, p. 177 186, 1898. 

 literature cited there. 



2) De Vries, H. Die Mutationstheorie. Vol. I, p. 113, 1901. 



3) Harris, J. Arthur Biometrika. Vol. VII, 1910. In press. 



Also the 



