62 



JOURNAL OF THE 



sand and tri-calcium phosphate, Tvath some calcium carbonate, and 

 small quantites of Iron and Aluminum. Quantitative estimations 

 were made of sand, and phosphoric acid, as the samples were very 

 dry. 



Variety i 

 2 



Number of 

 Analyses. 



9 

 8 

 I 



Average Phospho- 

 ric acid. 



per cent. 

 19.36 

 17.42 

 12.79 



Average Tri -Cal- 

 cium Phosphate. 



per cent. 



42.13 



38.52 • 

 37.92 



Average Sand. 



per cent. 

 42.64 



51-31 

 64.70 



An analysis of the white shell marl (Miocene ?) occurring above 

 variety at W. H. Kornegay's gave me, air dried 



Per cent. 



Calcium Carbonate ..41.84 



Sand -30. 15 



Phosphoric acid .50 



On the 27th day of August, I visited Duplin county in company 

 with Major Young, and began an investigation into the Phosphate 

 Rock. This was the first attempt at any thing like a systematic con- 

 sideration of the subject, and although from the very nature of the 

 case it could not be as full as was desired, still every fact herein 

 stated about the Rock is the result of careful personal experience. 

 The beds I visited are located in the western part of the county of 

 Duplin, North Carolina, 50 miles north of Wilmington, and from 

 2^ to 7 miles east of the line of the Wilmington and AVeldon Rail- 

 road. The places visited were the farms of W. H. Kornegay, Geo. 

 McClammy, Halstead Bowden, Alonso Middleton and David Chest- 

 nut, all within 4 miles, a little N. of E. of Magnolia, a station on the 

 W. & AV. Ry., 48 miles N. of Wilmington. Arminius Johnson, 5i 

 miles, John W. Murray, 8 miles, a little N. of E. of Magnolia. A 

 similar Rock occurs also in Kenansville, 7 miles N. of E. of Magnolia. 

 All these places are located a little east of the divide between the 

 Cape Fear and the North East Rivers, but much nearer the latter, 

 from which they are distant from 4 to 8 miles west. The beds so 

 explored appear to occupy the bottoms of former streams or lagoons, 

 whose positions are now occupied by "branches," "runs," and 

 ditches, emptying their waters into the North East River, or one of 

 its numerous tributaries. The configuration of the surface of the 

 county is that of a broad, flattish plateau, intersected by ci eeks, 

 branches, "runs," and swamps. Its elevation above sea level is 



