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The alumite of Tolfa, which, since my return to Europe, I have examined on the spot, conjointly with Gay-Lussac, has, by its oryctognostic characters and its chemical composition, a considerable affinity to compact feldspar, which constitutes the basis of so many trachytes and transition-porphyries.
An apartment is specially appropriated to the systematic order adopted by HAUeY in his new treatise on mineralogy; another is reserved for the method of WERNER. In both these oryctognostic collections, minerals of all countries are indiscriminately admitted.
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