19;^ 



tory was prcnidcd for a time (in the premises of the California & Hawaiian Sugar 

 Refining Corporation at Crockett. These temporary laboratories have been in\-al- 

 uable in the biological investigations. 



Full cooperation has been given by the Kngineering Department of the Board of 

 State Harbor Commissioners. Numerous courtesies ha\e also been extended by the 

 Los Angeles Harbor Engineer's Office. 



The best thanks of the investigators, and of those who nia>- profit b\' the results, 

 are due to these and other organizations and indi\iduals who have so signally co- 

 operated in the work. 



Laboratory space and facilities ha\'e been freely made axailable o\er a period of 

 nearly four years by the Department of Zoology of the University of California. The 

 laboratories of the Department of Plant Nutrition have been similarly opened for 

 such phases of the work as required liiochemical procedure. The inxestigators wish 

 to express their appreciation of the courtesy of these Departments and further to 

 thank the members of the Advisory Committee appointed by the Regents of the 

 I'niversity of California, for their cordial cooperation and assistance. 



