A PRELIMINARY REPORT ON CLAYS OF FLORIDA 63

taken for laboratory tests. The tests were made by the writer at Cornell University, Ithaca, New York. In a few cases samples of clay from deposits not known at the time of the field work were later sent to the testing laboratory.

 PREVIOUS WORK ON FLORIDA CLAYS
 Much work has previously been done on the clays of Florida, particularly on the sedimentary kaolins of Putnam and Lake counties and on the fuller's earth of Gadsden and Manatee counties. Most of this material has bcen published by the United 'States Geological Survey, but some has appeared in the Annual Reports of the State Geologist of Florida and some in scientific journals. The literature dealing with the clays of the State has been freely used. Credit for such information has been given in the footnote references in each case.


 ACKNOWLEDGMENTS
 The writer desires to express his deep appreciation of the liberal and patient help accorded him by numerous individuals during the progress of this work. Dr. H. Ries kindly granted the use of the clay testing laboratory at Cornell University, and has given the author many helpful suggestions, Mr. Herman Gunter, State Geologist, rendered much assistance in planning and carrying out the field work. Mr. T. C. Adams, a graduate student at Cornell University, kindly permitted the use of a chart which appears as Fig. 1. A very great number of people in the various localities rendered invaluable aid, and many gave liberally of theit time, in guiding and directing the party to the more important clay deposits. Among these may be mentioned Mr. J. E. 'Worthington of Lake Wales, Mayor F. D. Cosner and Mr. C. B. Taylor of Dade City, Mr. W. A. Fulton- of Brooksville, Dr. T. S. Kennedy of Williston, Mr. W. B. Powell of Tavares, Secretary of the Lake County Chamber of Commerce, Mayor C. A. Vaughn and Mr. Allen Strait of Umatilla, Mr. C. H. Tedder, Secretary of the Chamber of Commerce, Live Oak, Mr. H. D. Mendenhall, Consulting Engineer, of Lakeland, and numerous others. The brick and pottery manufacturers and superintendents of clay mining plants were uniformly courteous and generous in their assistance while the party was visiting their plants.