UNITED STATES DEPARTMENT OF THE INTERIOR, Stewart L. Udall, Secretary 



FISH AND WILDLIFE SERVICE. Clarence F. Pautzke, Commissioner 



Bureau of Commercial Fisheries, Donald L. McKernan, Director 



THE PREPARATION OF MARINE PHYTOPLANKTON 



FOR MICROSCOPIC EXAMINATION AND 



ENUMERATION ON MOLECULAR FILTERS 



by 

 Robert W. Holmes 



United States Fish and Wildlife Service 

 Special Scientific Report- -Fisheries No. 433 



Washington, D. C. 

 June 1962 



