DEPARTMENT OF MARINE BIOLOGY.* 



Alfred G. Mayor, Director. 



The yacht Anton Dohrn being in the service of the United States 

 Navy, we were unable to conduct researches at Tortugas, Florida, 

 and accordingly various expeditions were arranged for the prosecution 

 tion of studies which had been begun at Tortugas but might profitably 

 be extended into other regions. 



Professor E. Newton Harvey returned from Japan in January 1918, 

 whither he had gone under the auspices of the Department to procure 

 material for the chemical and physiological study of substances which 

 produce phosphorescence in marine animals. He succeeded in col- 

 lecting a large quantity of material of Cypridina, a copepod remarkable 

 for its luminosity. The results attained are recorded in his report 

 published herewith. 



Professor Ulric Dahlgren visited the Southern States to obtain 

 material for the study of the histology and physiology of the light- 

 producing organs of insects. 



On March 8, 1918, the Director, accompanied by Professor A. L. 

 Treadwell, Mr. Duncan Gay (artist), and the engineer of the De- 

 partment, Mr. John Mills, started from New York for Pigeon Point, 

 Tobago, British West Indies, returning on May 8; this was the Direc- 

 tor's second visit to Tobago. 



Arthur H. Cipriani, Esq., of Port-of-Spain, Trinidad, again kindly 

 placed at our disposal the estate house in the coconut grove of Pigeon 

 Point, Tobago, and his excellency Sir John Chancellor, governor of 

 Trinidad, Hon. H. Pinckney C. Strange, commissioner-warden and 

 chief magistrate of Tobago, and Harold Kernahan, esq., all gave us 

 aid and counsel and assisted the expedition in many ways. 



We took with us a small gasoline engine, which was installed in 

 a hull purchased in Trinidad and sold, at the termination of our visit, 

 to the police department of Port-of-Spain. 



We equipped the house at Pigeon Point with necessary furniture and 

 used it as a base for the study of the marine animals of the adjacent 

 ocean. 



Professor Treadwell has for some years been conducting a systematic 

 study of the Eunicidse of the coral reefs of the Atlantic Coast of North 

 America. He had previously visited Tortugas, Bermuda, and Porto 

 Rico, and it seemed desirable that he should pay special attention to 

 the southernmost end, the West Indian chain of islands, in order to 

 determine the range of these West Indian forms to the southward and 

 the influence of South America upon the West Indian fauna sensu 



*Situated at Tortugas, Florida. 



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