500 



MESSRS. WHITE AND TREACHER ON THE [Aug. 1906, 



either very scarce, or — as was later found to be the case — entirely 

 wanting ; and a closer inspection revealed the brown granules, 

 hard bands, nodules, and other evidences of phosphatization. 



The pit was revisited by both of us on three or four occasions 

 during the ensuing autumn, and some attempt was made to ascertain 





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the extent of the phosphatic beds ; but little further information 

 was obtained until the winter, when the withering of the vegetation 

 and the ploughing of the fields revealed a number of white patches 

 in the soil, marking the spots where Chalk lay near the surface. 

 An examination of these rubbly patches and of the disintegrating 

 rock beneath them, has enabled us to work out the sequence of the 



