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i8 4 Argillacecus Genus. It often effervelces, though very flowly, with the mineral acids. Feels rather greafy. flnml aCed , on , b , ur , nin S c ^ als ? >t burns with a weak flame and fulphureous fmdl; the refiduum is t cn Jigntgrey. It thus loles a confiderable part f US /r W A eigbl: ' Some wil1 hardl y bum but with the affiftance of bellows. ■ It fee ms to differ frcm the former variety. in containmg bitumen. The fpecimen in Leihe O. o6:, has its fp, gr. 1,995 ; and that of Lefkc,‘ 959 , has its fpec. grav, 2,053. Both effervefce, though very flowly witu . acids. J> It fometimes bears the impreffion of fiih. 4th Family. Fuller’s Earth. Walkererde of the Germans Srneftis. * Colo 11 r, the foffil fo called, has almotl always fomeihade of green, commonlv lightolive, grcen- ' 1 giey, or greenifh white, or greenifh brovvn, more rarely yellovvifh grey, or grcyifh white. 1 he greenifh fhade is made vifible when the earth is breathed on, or moiftened. Flefh red has alfo been found in Saxony, but of an inferior quality. 1 uftre, o. Tranfparency, 0. Fraäure, earthy, often inclining to the une- ven, fometimes to the flaty, fometimes fine ear- y, jnc lghtly participating of the conchoidal. rragments, o. Receives