that of changing two opaque bodies into a transparent body to make glass, for instance; or else two transparent bodies into an opaque body for making soap. Besides, you know that chemistry actually teaches us that leather is a real salt, a _tannate of gelatine_. This assertion was not uttered with confidence until M. Pelouze had extracted from tan in late years the tannic acid in a state of remarkable purity. Besides this, you may now explain a phenomena which is repeated at a great distance upon the ocean, at the time of some lamentable shipwreck. The journal which records for you the history of one of these sad events often tells you that in the last moment of famine, the unhappy survivors took to eating their shoes, and that life is sometimes prolonged by these means! Certainly, for the gelatine possesses nutritious properties, even when its peculiarities are stained with a thousand impurities, as is leather. The subject upon which we have endeavored to present some observations, is so capable of being extended that a large volume in octavo would scarcely suffice to contain all the historical knowledge relating to it. But such a dissertation, carried out to the extent or with the exactness which it admits of, would only constitute at last a kind of catalogue or bare enumeration of the thousand modifications which human vestures have undergone down to our times. The memory of the reader would be unable to retain so prodigious a number of minute particulars, and the curiosity of his mind, fatigued by so many useless details, would be extinguished before finishing the third part. These changes have often, it is true, nothing for their object but the accessory and secondary parts of dress, as the following passage, which we meet with in the _voyages_ of M. de Chateaubriand, seems to point out. “One thing has at the same time struck me and charmed me; I have met in the dress of the Auvergne peasant the attire of the Breton peasant. Whence comes this? It is because there was formerly for this kingdom, and for all Europe, a _groundwork_ of a common attire.” (Vol. 2., p. 296.)