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Flintshire. H 2 O 0.54 82.53 1.05 15.88 0.60 63.40 2.34 33.66 1.51 95.69 1.02 1.86 1.32 93.56 4.52 0.43 SiO 2 FeO Fe 2 O a CaCO 3 A 2-ton chert runner working on flint alone lasted ten months, when it was reduced to 7cwt. CERAMIC CHEMISTRY. 31 KIESELGUHR, or infusorial earth, consists of the siliciotts integument of lower organisms. It is best detected under