organic material and a source of chemical input t o the atmosphere by bubblebreaking and wind-suspension processes.
Acknowledgment
We thank C. Haile for advice on chlorinated hydrocarbon analysis and P. Choitz and C. H. Lim for assistance with chemical analyses. Literature Cited (1) MacIntyre, F., in “The Sea”, E. D. Goldberg, Ed., Vol 5, pp 245-99, Wiley-Interscience, New York, N.Y., 1974. (2) Liss, P. S., “Chemistry of the Sea Surface Microlayer”, in “Chemical Oceanography”, J. P. Riley and G. Skirrow, Eds., Vol 2,2nd ed., pp 193-243, Academic Press, New Ymk, N.Y., 1975. (3) Langmuir, I., Science, 87, 119-23 (1938). (4) Szekielda, K.-H., Kupperman, S. L., Klemas, U., Polis, D. F., J. Geophys. Res., 77 (27). 5278-82 (1972).
(5) Duce, R. A., Quinn, J. G., Olney, C. E., Piotrowicz, S. R., Ray, B. J., Wade, T. L., Science, 176,161-3 (1972). (6) Williams, P. M., Deep-sea Res., 14,791-800 (1967). (7) Baier, R. E., Goupil, D. W., Perlmutter, S., King, R., J. Rech. Atmos., 8 (3-4). 571-600 (1974). (8) Garrett, W. D., Deep-sea Res., 14,661-72 (1967). (9) Sieburth, J. McN., Willis, P.-J., Johnson, K. M., Burney, C. M., LaVoie, D. M., Hinga, K. R., Caron, D. A., French, F. W., Johnson, P. W., Davis, P. G., Science, 194, 1415-18 (1976). (10) Barker, B. C., Hatcher, R. F., J . Phycol., 10 (12), 185-99
119741. .~~~, (11) George, D. G., Edwards, R. W., Limnol. Oceanogr., 18,798-800 (1973). (12) Parker, B., Barsom, G., BioScience, 20,87-91 (1970). (13) Andren, A. W., Elzerman, A. W., Armstrong, D. E., J. Great Lakes Res., 2 (Suppl. l ) ,101-10 (1976). (14) Baier, R. E., J. Geophys. Res., 77 (271,5062-75 (1972). (15) Eisenreich, S. J., Armstrong, D. E., Enuiron. Sci. Technol., 1 1 (5), 497-501 (1977). (16) Stalling, D. L., Tindle, R. C., Johnson, J. L., J.Assoc. Off. Agric. Chem., 55,32-8 (1972). (17) O’Shea, T. A., Mancy, K. H., Anal. Chem., 48 (ll),1603-07 (1976). (18) Coilins, P. F., Diehl, H., Smith, G. F., ibid., 31 (ll),1862-7 (1957).
(19) US. Environmental Protection Agency, “Methods for Chemical Analysis of Water and Wastes”, 298 pp, 1974. (20) Leggett-Bailey, J., “Techniques in Protein Chemistry”, 2nd ed., American Elsevier, New York, N.Y., 1967. (21) Elzerman, A. W., PhD thesis, University of Wisconsin, Madison, Wis., 1976. (22) Berker, D. R., Zeitlin, H., J. Geophys. Res., 77 (27), 5076-87 (1972). (23) Hoffman, G. L., Duce, R. A., Walsh, P. R., Hoffman, E. J., Ray, J.. J. Rech. Atmos.. 8 (3-4),745-59 (1974). (24) Piotrowicz, S. R., Ray, B. J., Hoffman, G. L., Duce, R. A., J . Geophys. Res., 77 (27), 5243-54 (1972). (25) Wheeler. J. R.. Limnol. Oceanoer.. 20.338-42 (1975). . , (26) Huntzicker, J.‘J., Friedlander, K., Davidson, C. I., Environ. Sci. Technol., 9 (5), 448-57 (1975). (27) Colston, N. V., Jr., “Characterization and Treatment of Urban Lake Runoff”, EPA-670/2-74-096,157 pp, 1974. (28) Wilkniss, P. E., Bressan, P. J.,J.Geophys. Res., 77 (27), 5307-15 (1972). (29) Buat-Menard, P., Morelli, J., Chesselet, R., J. Rech. Atmos., 8 (3-4), 661-73 (1974). (30) Hoffman, G. L., Duce, R. A., J.Geophys. Res., 77 (27), 5161-9 (1972). (31) Eisenreich, S. J., PhD thesis, University of Wisconsin, Madison, Wis., 1975. (32) Rigler, R. H., Limnol. Oceanogr., 13 ( l ) ,7-13 (1968). (33) Levesaue, M.. Can. J. Soil Sci.. 49.365-73 (1969). . . (34) Jackson, T. A., Schindler, T. W., Verh. Znt. Ver. Limnol., 19, 211-21 (1975). (35) Koenings, J. P., Hooper, F. F., Limnol. Oceanogr., 21 (5), 684-96
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(1976). ~ - -_,_ .
(36) Saijo, Y., Mitamura, O., Ogiyama, K., Jpn. J.Limnol., 35 (3), 110-16 (1974). (37) McNaught, D. C., Hasler, A. D., Limnol. Oceanogr., 6 (l), 53-60 (1961).
Received for review July 1, 1977.Accepted October 6,1977.Support provided in part by the National Oceanic and Atmospheric Administration’s Office of Sea Grant, US.Department of Commerce, through an institutional grant to the University of Wisconsin and by the Office of Water Resources Research Project No.14-31-0014140 (B-088-WZS), administered through the University of Wisconsin Water Resources Center. Assistance also given by the University of Minnesota, Minneapolis.
Correction In the article, “Trimmed Spearman-Karber Method for Estimating Median Lethal Concentrations in Toxicity Bioassays”, by M. A. Hamilton, R. C. RUSSO,and R. V. Thurston [Enuiron. Sci. Technol., 11,714-19 (1977)], M. C. Mobley and N. R. Ferri have pointed out some errors in the calculated confidence interval endpoints given in Tables I1 and VI. T h e equation in the Appendix of our paper is correct, but we have found a programming error which resulted in most of the reported confidence intervals being too wide. For example, for data set 1C in Table 11, the a%-trimmed Spearman-Karber confidence interval endpoints for a = 0,5,10, and 20% should be (39.14,44.49), (39.86, 45.381, (39.51,46.34), and (40.77,45.17). A listing of the FORTRAN program which we are using to do the &-trimmed Spearman-Karber calculations is available upon request.
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