these, as well as all the other repositories of this singular compound mineral, are of cotemporaneous formation wit the rocks in which they are contained. Geographic Situation. Very beautiful varieties of the different kinds of agate occur in the porphyry, amygdaloid, and greenstone rocks of Scotland. On the Continent there is a great deposi tory of agate at Oberstein on the Rhine : it also occurs in Saxony, Silesia, Bohemia, and Italy; also in the island Sicily. It likewise abounds in Siberia, East Indies, and China. Uses. Agate is sometimes cut into snuff-boxes, and ring- stones: the larger masses are hollowed into mortars, or cut into elegant vases. It was much prized by the an cients, who executed several fine works m it. In the Electoral Cabinet at Dresden, and the Ducal Cabinet in Brunswick, there are beautiful vases of agate. At Ober stein on the Rhine, the amygdaloidal rocks are regularly quarried for the agates they contain, and these are cut and polished, and exported to other countries. The cut ting, polishing, and selling of the agates (Scotch) of the amygdaloid of this country, is now carried on to a very considerable extent, and is to many a lucrative employ ment. VII. PITCH-