?4 MANURES. |^ 



again diflblved and again precipitated, regains 

 the principal part of its original weight, and 

 lofes its yellow fhade j the precipitated matter 

 drying to 2.Jlone-coloiired powder. 



From thefe circumflances it appears, that 

 the component parts of an hundred grains 

 of the clay of Hemlby, which may be con- 

 fidered as a fpecimen of the calcareous clays 

 ef the eaftern coaft of Norfolk,- — are 



50 grains of clay^ probably containing 



fomefmall proportion of iron^ 

 43 grains of ^ fomewhat impure chalk; 

 7 grains o{ Jand; with an inconliderabk 

 admixture of coloured granules and 

 fragments, 



100 grains, 



^. Soft Chalk of Thorp-next-Norwich, 



In its natural jtate^ — it is fituated in an ex- 

 tenfive bed, or rock ; forming a bank of the 

 river Yare. Its colour a yellowilh-white, or 

 pale draw colour : its contexture that of a 

 fufr, light, fmooth chalk, fufficiently firm, when 

 perfedly dry, to mark with *, 



• It is obfervable, that the fpecimen under analyfis 

 Jias been taken from the quarry, and kept in a dry fitua- 

 tign^ ii^ore than four years. 



