(aggl. erde), the name given by Professor Trommelforff to a new simple earth, which he discovered in the Saxon beryl. It is distinguished (he says) from other earths by the following properties: It is white, and totally insoluble in water. In a fresh state, when moistened with water, it is somewhat ductile. In the fire it becomes transparent and very hard, so as to scratch glass, but remains inodorous and insoluble in water. The burnt earth dissolves very easily in acids, and produces with them peculiar salts, which are entirely devoid of taste; and hence he gave it the name of agglutinative earth. Fixed alkalies do not dissolve this earth either in the dry or in the wet way; and it is equally insoluble with the carbonic acid and with caustic ammonia. It has a greater affinity to the oxalic than to other acids. Professor Trommelforff informs us, that a full account of this earth, accompanied with an accurate description, by Dr Bernhardi, of the fossil in which it is found, will appear in the first part of the eight volume of his Journal of Pharmacy.