(_d._) _Alum_, which we have seen figure in many of the adopted formulæ, is, nevertheless an unprofitable means of preservation. Extensively used in commerce, and employed from time immemorial in dyeing, it has only recently attracted the attention of preparers. This salt, to which the new chemical nomenclature has successively assigned the names of _double sulphate_, _triple sulphate_, _acid sulphate of alumine and potash_; has been experimented upon by myself, and has not answered my expectations. I have investigated the cause of this failure, and think I have found it; in analysing this compound, for every hundred parts I have obtained Sulphate of alumine, 36.85 Sulphate of potash, 18.15 Water, 45 ---- 100 One hundred parts of this salt contains 10.86 of alumine. At the temperature of 12° centigrade, five hundred grammes of water dissolves thirty grammes of salt, from whence it results that a pound of water contains in solution only eighteen grains of alumine; from whence I have suspected that the little efficacy of alum for the preservation of animal matter, depends on the too small quantity of alumine in the solution. A fact convinced me that I was right: twenty-four hours after the immersion of a corpse in a bath containing the acid sulphate of alumine, I have observed that all the alumine was absorbed by the animal matter. Finally, the experiments which I have tried with the salts of alum, more rich in alumine, and more soluble in water, and the happy results I have attained, authorizes me to say: alum is a bad means of preservation, _because it is not sufficiently soluble, and does not contain enough alumine_. The reader will naturally again recur to the subject when we come to the exposition of my researches. SECT. 3.--_Means of preservation applied to each tissue._ In our first paragraph, we have passed in review the different preparations which ought to precede the application of preservative means; in the second, we have seen these numerous means, and we were compelled to deliver an impartial judgment. It remains for us to explain here how anatomists have applied them to the tissues taken separately. We shall abstain from relating the preparations which precede the application of preservative means, because they are foreign to the subject which occupies us, and would uselessly prolong a discussion already too much extended. 1. _Fibrous tissues._--_Articulations, aponeuroses, tendons, and ligaments._--The process generally adopted is due to M. J. Cloquet, in nearly following the method employed by the tanner, he has succeeded in preserving the suppleness of these tissues. “The following,” continues he, “is the process which I have adopted.