REPORT ON OCEANOGRAPHY 95 



In the course of dredging for geological materials, large numbers 

 of biological specimens were also obtained, which have been described 

 by specialists. The results of this work have been published chiefly in 

 the Proceedings of the California Academy of Sciences, Fourth Series, 

 Volume 27, Nos. 9-16. 



HOPKINS MARINE STATION (By Rolf L. Bolin) 



An investigation of the fluctuations in the populations of marine 

 organisms correlated with fluctuations in hydrographic factors was ini- 

 tiated in 1950 under an Office of Marine Research contract. A shallow 

 water oceanographic station, extending to 30 meters in Monterey Bay 

 and a deep-water station, extending to 1000 meters in the waters off 

 Monterey Bay are being occupied at weekly intervals. Temperature, 

 salinity, oxygen, phosphate, silicate, and light penetration data, and 

 plankton samples from both surface layers and deep waters are being 

 collected. Until the present time more than 300 stations have been 

 occupied, more than 20,000 physical observations and chemical deter- 

 minations, have been made, and the analysis of the plankton samples 

 and their correlation with hydrographic fluctuations is in progress. 



OCEANOGRAPHY BRANCH OF THE NAVY ELECTRONICS LABORA- 

 TORY, SAN DIEGO, CALIFORNIA 



Research has continued in physical oceanography, underwater 

 sound, and sea floor structure. The main emphasis has been directed 

 toward the temperature structure of the ocean and upon the relation 

 of sound transmission to physical properties of the sea. Much work 

 has also been done in the field of marine geology, especially regarding 

 sea floor processes and interpreting sea floor structure from echo sound- 

 ing profiles. 



SCHOOL OF TROPICAL AND PREVENTIVE MEDICINE, LOMA LINDA, 

 CALIFORNIA (Prepared by Bruce W. Halstead) 



Since the inception of the School of Tropical and Preventive Med- 

 icine in 1948, the Department of Ichthyology and Herpetology, under 

 the supervision of Dr. Bruce W. Halstead, has directed its efforts to- 

 ward investigating the problem of poisonous fishes in the tropical Paci- 

 fic. Field studies were conducted in the following areas during Sep- 

 tember, 1950, to July, 1953; Phoenix, Line, Hawaiian, Marianas, East- 

 ern and Western Carolines, Johnston, Okinawa, Japan, Galapagos, Co- 

 cos, La Plata (Ecuador), Gulf of California, and Panama Bay. The in- 

 vestigations thus far have been concerned largely with the epidemio- 

 logical aspects of the problem, viz., the specific identification of these 

 fishes and compilation of data relative to their geographical distribu- 

 tion. All fishes brought into the laboratory are identified as to their 



