It is necessary, in effect, to preserve to the tissues in embalming, a freshness and suppleness which is lost by desiccation, at the end of some months, in the subjects injected for the use of the anatomist; it is necessary, above all, to secure to the body, in this latter case, a more prolonged preservation: the facts which I can show, will prove that I have attained my end. 1.--_Preservation of bodies for dissection._ My experiments upon gelatine have conducted me to the knowledge of some one of the constituent parts of different animals. I had studied the action of chemical agents habitually employed in the arts; the labour of the tanner, or leather dresser, of the parchment maker, the fabrication of glue, which I have practised on a large scale from 1819 to 1828, have equally furnished me with valuable data. In 1826, my attention having been arrested by MM. Bègin and Serrulas, on the preservation of objects of pathological anatomy, trials were made at the Val-de-Grace. In 1828, M. Alphonse Sanson, disposing himself to prepare a cabinet of anatomy, at the request and for the use of some English gentlemen, proposed to me to occupy myself with the question relative to preservation, which obliged me to make some researches; but it was not until 1831, and at the solicitation of M. Strauss, an anatomist of well known merit, that I undertook serious and continued labours upon the preservation of bodies. From this moment, I employed all my attention and cares to resolve this question. The researches on the preservation of bodies demanded the re-union of different circumstances, without which it would have been impossible for me to have attained a satisfactory solution. It is easy to conceive, in effect, the great difference which ought to exist between the action of any given liquid upon some scruples of animal matter, and its action on an entire corpse; I ought to confess, also, that without the extreme courtesy of M. Orfila, who placed at my disposition, at the practical school of the faculty of medicine, all the objects of which I might stand in need, it is probable that it would have been impossible for me to have arrived at positive results. I encountered some difficulties, some resistance, and even something more, on the part of some scientific notables, and also of some ambitious subalterns; but I have surmounted all. This work on the preservation of bodies ought only to be considered as the suit of that in which I have treated of the preservation of alimentary meats. It is only the circumstances of which I have just spoken, that have determined me to finish this work sooner.