PROGRESS IN BIOLOGICAL INQUIRIES, 19 3 3 381 



University, susceptibility of fish to tubercular bacilli; Dr. Duncan 

 S. Johnson, Johns Hopkins University, the ecology of vegetation of 

 Bogue and Shackleford Banks; Donald B. Lawrence, Johns Hopkins 

 University, effect of sand dunes movements on flora of Shackleford 

 Banks; Edward D. DeLancaster, Johns Hopkins University, blue- 

 green algae of the Beaufort region. 



The facilities of the station Avere also utilized by the United States 

 Chemical Warfare Service for tests of wood preservatives and by the 

 Bureau's Division of Fishery Industries for experiments on the dura- 

 bility of net twines treated with different preservatives. Cooperative 

 tests were made with the Woolsey Paint Co. in respect to the anti- 

 fouling and protective value of copper paints; with the Tropical 

 Paint & Oil Co. on the suitability of Bakelite varnish for marine 

 use; and with the Union Carbide & Carbon Corporation to deter- 

 mine the value of different grades of stainless steel and other steel 

 alloys for the prevention of fouling of ship bottoms. 



Te7Tapm culture. — The propagation of diamond-back terrapin 

 was continued at the Beaufort laboratory in cooperation with the 

 Division of Fish Culture and yielded in 1933 a total production of 

 10,060 young terrapins, which is next to the highest record obtained 

 thus far in the culture of this species. For the first time the distri- 

 bution of young terrapins has been extended so as to include the 

 waters of Florida, South Carolina, and North Carolina. 



In cooperation with the Florida Department of Conservation 2,000 

 terrapins were planted on May 12, in selected marshes and protected 

 areas in the Choctawhatchee Bay region. In South Carolina a simi- 

 lar planting was made on April 27, in the vicinity of Charleston in 

 cooperation with the State Board of Fisheries. A somewhat greater 

 distribution of young terrapins amounting to 5,730 was made in 

 North Carolina in cooperation with the Department of Conserva- 

 tion, because of the scarcity of terrapins in these waters and in ap- 

 preciation of the continued support received from this State in prop- 

 agation of this species. The remaining 330 terrapins have been 

 saved for breeding purposes and for the continuation of the experi- 

 mental studies conducted by Dr. George T. Hargitt and Dr. Bert 

 Cunningham, of Duke University. 



Over 931/^ percent of the original hatch of 10,574 were success- 

 fnlly reared to the age of 9 months at the Beaufort laboratory before 

 liberation. It is believed that these operations establish the highest 

 survival record yet obtained in the culture of fresh water and marine 

 animals where the young of a species are reared over a period of 

 several months. The output of the Beaufort station hatchery since 

 1930 has been as follows: 1930, 5,778; 1931, 5,500; 1932, 11,08G; and 

 1933, 10,060. During the summer of 1933 a new brood of 10,624 

 young terrapins was obtained. These terrapins are now being fed 

 for a short period in the fall and are then placed out of doors in 

 protected hibernating pens in order to reduce the cost and labor of 

 their care and feeding as required previously when they were kept 

 during the winter in the heated rearing house. Distribution of 

 the 1933 brood will be made during the following spring throughout 

 the South Atlantic States in cooperation with the various State 

 departments. 



