804 Puh. Puget Sound Biol. Sta. Vol. 2, No. 51 



I wish to express my appreciation of Dr. T. C. Frye^ Professor of 

 Botany in the University of Washington, at whose suggestion this work 

 was undertaken, for his interest and able suggestions. I am grateful to 

 Dr. G. B. Rigg, of the University of Washington, and Dr. C. M. Child, 

 of the University of Chicago, for helpful assistance; acknowledgment 

 is also due to Dr. C. L. von Ende, Professor of Chemistry in the Univer- 

 sity of Idaho, for providing all needed facilities for the preparation of 

 chemicals and for helpful advice. 



