ACKNOTLEDGMENTS 



The studies of the chloroplast pigments of various organisms 

 were carried out iinder the auspices of the Carnegie Institution of 

 Washington at the Department of Plant Biology located at Stanfordj, 

 Californiao They were pursued during one summer at the Marine Labo= 

 ratory of the University of Hawaii.o The extension and application 

 of the chromatographic methods to inorganic separatory problems were 

 the result of work performed under the auspices of the Uo So Atomic 

 Energy Commission at- the Argonne National Laboratory, Lemont, IllinoiSo 



Leaves from many species of cycads were provided by the green= 

 houses of the University of ChioagOo 



A large number of interested colleagues aided in the culture ^ 

 oolleotion, and identification of various species, in the development 

 of analytical techniques, and in the discussion and correlation of th© 

 resultso In this brief acknowledgment, the nature of these contribu^ 

 tions can only be indicated. The significance of this assistance is 

 revealed by the investigations themselves and by their usefulness in 

 other fields such as analysiSj, photosynthesis^ physiology, and taxonomy,, 



