SECRETARY'S REPORT 23 



in anthropological and zoological field work over a period of several 

 months in the Kalahari Desert region of South-West Africa. 



During April 1952, Dr. E. A. Lachner and William T. Leapley in- 

 vestigated the ecology and life history of fresh-water fishes in the 

 streams draining the mountain and Piedmont plateau sections of the 

 Atlantic slope from Virginia southward to Georgia and thence west- 

 ward in the streams of the Gulf coast drainage to Alabama. After 

 crossing the Mississippi flatlands, field work was continued in the 

 river systems of northeastern Texas and Oklahoma. On the return 

 trip collections were made in the streams of the Ozark uplands in 

 Arkansas and also in those of Kentucky. A collecting trip which 

 extended from near Shreveport, La., to Kerrville and Laredo, Tex., 

 and thence down the Rio Grande Valley to Padre Island and eastward 

 along the Gulf coast, to procure insects prevalent only in the fall 

 months, was made by Oscar L. Cartwright during September-October 

 1951. At the request of the Pacific Science Board, National Research 

 Council, Dr. Joseph P. E. Morrison of the division of mollusks was 

 detailed early in June 1952 to make an ecological survey of Raroia 

 Atoll in the Tuamotu Islands. 



From February to May 1952, Dr. Lyman B. Smith, through the 

 cooperation of the Rockefeller Foundation and various Brazilian 

 agencies, notably the Servigo Nacional de Malaria, the Herbario 

 "Barbosa Rodrigues," the Museu Nacional, the Jardin Botanico do 

 Rio de Janeiro, and the Instituto de Botanico do Sao Paulo, carried 

 on a field study of the relation of the Bromeliaceae to malarial control 

 in eastern Brazil between Para and Santa Catarina. Dr. Egbert H. 

 Walker returned to Washington, D. C., on September 30, 1951, after 

 the completion of the botanical field work on the Ryukyu Islands spon- 

 sored by the Pacific Science Board, National Research Council. In 

 October 1951, Jason R. Swallen arrived in Honduras where, as the 

 guest of the Escuela Agricola Panamericana, he was provided trans- 

 portation that enabled him to collect grasses in the pine forests, open 

 grasslands, and cloud forests, principally in the Departments of 

 Morazan and El Paraiso. 



During the year seven field trips were made for the purpose of col- 

 lecting fossils and studying geological strata. A. L. Bowsher and 

 William T. Allen, with the assistance of members of the staff of the 

 New Mexico Bureau of Mines, assembled invertebrate fossils from the 

 Mississippian, Pennsylvanian, and Permian strata in the Sacramento 

 Mountains, N. Mex. In the latter half of October, Dr. G. A. Cooper 

 joined Dr. B. N. Cooper, of the Virginia Polytechnic Institute, in a 

 study of the f acies relationships of nonmarine Ordovician beds in the 

 southern Appalachians. Late in October 1951, A. L. Bowsher accom- 



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