Whoeled Milkweed 
39 
ACKNOWLEDGMENTS 
The writer wishes to express his thanks to the follbwing per- 
sons who have aided him in the prosecution of the work on the 
whorled mlkweed problem : County Agents G. P. Newsom, E. D. 
Smith, H. C. Nevius, E. H. Divelbliss, L. P. McCann, B. H. King, 
and Waldo Kidder gave very material and helpful assistance in 
the field work. Claude C. Wakeland also rendered assistance in 
the field. To George E. Egginton, seed analyst of the Colorado 
Seed Laboratory, thanks is due for his careful work in making 
the germination tests reported in Table I. The suggestions 
Dr.W.W.Robbins thruout the work have been highly appreciated 
and have aided the writer materially. To J. G. Leach thanks is 
due for his painstaking criticism of the manuscript. 
