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1955 fieldwork. Rezak performed the majority of the ship board analyses, and Neuman and Walter took and cared for the cores. Help also was received with core handling from Donald Stewart in 1955 and from James Double in 1956.Fronr their work leading toward publication of a separate report on the Foraminifera, Ruth Todd and Doris Low have provided information on occurrence of the principal foraminiferal species; and ~iiss Low undertook the onerous responsibility of typing, checking, and processing the often con1plicated pages of this report. Kenneth Lohman studied selected samples for diatoms in the midst of heavy pressure from other work. Biological determinations have also been provided by specialists of the U.S. National 11 useum and other organizations as indicated on tables 3, 10, and 11. The fishes were identified by Leonard Schultz, of the U.S. National Museum, and plankton collections were reported on by David L. O'Berry, of the University of Miami Marine Laboratory. As usual, Frederiek M. Bayer has been a constantly available and generous source of information and advice on ecological subjects.Arrangements for work at Andros Town in 1955 were made by Kay Norton and Arne Lindroth of the Wenner-Gren Foundation. At Andros Town much courteous help was received from Gunnar Lindstrs3m, Kenneth Sundin, and Misse Peterson.Both in 1955 and in 1956, F. G. Walton Sn1ith and Hilary Moore came to the rescue at the crucial mon1ent with marine equipment from the University of Mian1i Marine Laboratory. To them and to G. E. Voss, of the Marine Laboratory, and Robert Ginsburg, of Shell Development Corp., I am warmly grateful for rnany favors and much useful advice. To Farrington Daniels I am also grateful for taking tirne out from a very busy period in Washington, D.C., for discussion of the precipitation problem and for subsequent helpful correspondence.An emergency grant of $785 fron1 the Geological Society of America permitted F. D. Sisler's employment for critically needed bacteriological work until arrangements could be completed for his assignrnent to the U.S. Geological Survey. The Department of Geology, U.S. National Museum, generously provided laboratory space and facilities for his work for the duration of this project.Most of the collaborating authors have read and criticized all sections of the report, and D. L. Graf and R. S. Boardn1an critiqued the entire report. Helpful review of individual sections was made by F.

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Table 2. Chronic hypotensive action of SC-5233 in metacorticoid rats; SC-5233 was administered on days 8 to 27, inclusive. Blood pressure (mm) Day -SC-5233 Controls 1-7 184-208 182-210 9 176* 189 11 169t 190 15 162f 191 17 158t 181 21 153t 179 23 157* 177 25 155t 180 28 160* 177 32 174 183 * P < 0.05 that change of pressure equals that of controls (5). t P < 0.01 that change of pressure equals that of controls (5).tive is considerably more potent than SC-5233 in blocking the renal excretory effects of DCA (2). Apparently the renal mineralocorticoid-blocking and the antihypertensive properties of SC-5233 are not directly related. Instead, the latter property might be mediated by the reversal of some internal electrolyte disturbance that had been instituted by the temporary treatment with DCA, such as aq increase in the intracellular sodium compartment (11-13).