I might multiply these examples, and produce several hundred trials equally conclusive, made during the course of my experiments; but as it could not result in any advantage to the reader, I forbear. Besides, the use that Captain Durville has made of my liquor during his scientific voyage, and the thousand proofs to which it is every day subjected on the part of men, whom the study of natural history induces to have recourse to it, will be the most faithful and sure confirmation. In fine, I shall always be most happy to receive the observations, remarks, and criticisms of those, who, with an interest for science, may have occasion to point out to me any circumstances calculated to modify the applications. Many, without doubt, may have escaped me, and as I desire, above all things, to bring my processes to the highest degree of perfection, I shall be thankful for any aid that may contribute to this end. The following is the composition of the liquids[S] which I employ for preserving the different pieces of normal anatomy, pathological anatomy, and natural history. [S] These liquids, which may be employed for the limited preservation of fish destined to dissection, will not answer for their indefinite preservation, but I shall have occasion, in my work on the preservation of pathological anatomy, to indicate another process. 1. A solution of the simple sulphate of alumine, at six degrees; that is to say, the solution of a killogram of this salt in six quarts of water. 2. A solution of simple sulphate with water saturated with arsenious acid:--five hundred scruples of arsenic to forty quarts of water;--six quarts of this solution to one killogram of the simple sulphate. 3. Of the acetate of alumine at five degrees, saturated with arsenious acid. _Usage._--For fifteen days I cause the pieces to disgorge in the first liquid; at the end of this period they are withdrawn and placed in the bath of a second liquid, where they may remain for from three to five months; finally, they are withdrawn and placed in a third liquid. It is thus that I have preserved preparations for three or four years, which the public is welcome to come and see. It would be useless to recur here to dried preparations, having given an example of them in the seventh chapter; nevertheless, as I then only indicated the injection of acetate of alumine, without making any observation, one of the results which I have attained by the simple sulphate, reported now, will be a useful confirmation of the process which I have given before. Distinguished men have examined the viscera and vessels of a subject injected for six months, and we shall see how satisfactory was the state of the organs after so long a period.