In 1734 appeared in three volumes (Opera philosophica et mineralia, the first volume of which (his Principia) contained his view of the first principles of the universe, a curious mechanical and geometrical theory of the origin of things.
He does not tell us how it was prepared, but he describes the method of subliming it, which can leave no doubt that it was real sal ammoniac. In the Opera mineralia of Isaac Hollandus the elder, there is likewise a description of the mode of subliming sal ammoniac. Basil Valentine, in his Currus triumphalis antimonii, describes some of the peculiar properties of sal ammoniac in, if possible, a still less equivocal manner.
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