BIBLIOGRAPHY OR FLORIDA PHOSPHATES. 
71 
1888. Penrose, R. A. F., Jr.: 
Nature and Origin of Deposits of Phosphate of Rime, with 
an introduction by N. S. Shaler. U. S. Geol. Surv. 
Bull., 46, 143 pp., 3 pis., 1888. 
This paper includes a general review of all phosphate 
deposits known at that time. The phosphate deposits of 
Hawthorne and vicinity were personally examined and are 
described on pages 78 and 79. The report contains a 
bibliography of publications on phosphate. 
1890. Shrader, Jay: 
Florida. The Underground Wealth and Prehistoric 
Wonders of Polk and DeSoto Counties, 34 pp. Bartow, 
1890 * 
An account of the phosphate mining industry as 
developed at that time is included in this report. 
1890. Ledoux, Albert R.: 
The Newly-discovered Phosphate Beds of Florida. New 
York Acad. Sci. Trans., IX, pp. 84-94, February, 1890; 
Eng. Min. Jour., XLIX, 175-177, 1890; Sci. Am-. Supp., 
XXX, 12104-12105, No. 758, 1890. Read before the 
New York Academy of Science January 27, 1890. 
This paper contains a description of the hard rock 
phosphate deposits in Marion, Citrus and Hernando 
Counties, based on examination made in 1889 or 1890, and 
soon after the hard rock deposits were discovered. Refer¬ 
ence is made to an earlier publication on the hard rock 
phosphate at Dunnellon by Professor W. P. Frost, of 
Savannah. The place of publication of Prof. Frost’s paper, 
however, is not given. 
1890. Pickel, J. M.: 
Florida Phosphate. Fla. Agri. Exp. 'Station, Bull. 10, pp. 
6-11, July, 1890. 
A brief account of the Florida phosphates from samples 
received for analysis, and brief notes on the discovery of 
„ the deposits. 
