Nevertheless, as we ought to be impartial, we should mention here the dangers attendant on the use of this terrible mineral, so much boasted by Sir S. Smith, president of the Linnean Society of London. When there is occasion to mount a subject prepared with sublimate, whether it has been employed in powder or in solution, in arranging the animal there arises a dust, which penetrates the nostrils, and may cause serious accidents. Arsenic, though much less energetic, is not even free from this inconvenience. Thus it is only with much precaution that preparors should handle preparations in skins which they receive from foreign countries, the substances used in the preparation of which they are ignorant. Let us now pass to the other preservatives in liquor, less generally employed, at the present time, although some of them may be very useful. The following is the tanning liquor which I have proposed in the Cabinet of Natural History: Tan, or oak bark, 1 ℔. Powdered alum, 4 ℥. Common water, 20 ℔. An ancient author, the Abbe Manesse, composed his bath in the following manner: Alum, 1 ℔. Sea-salt, 2 ℥. Cream of tartar, 1 ℥. Common water, 4 ℔. _Liquors employed externally as lotion._ When an animal has been mounted or prepared, and fears exist less the insect should attack it, this may be prevented by washing its feathers, its hairs, or its naked skin, with one of the liquors which we are about to indicate. Animals exposed to the open air have, above all, need of being thus treated, and yet, by an inconceivable negligence, many amateurs permit their collections to be devoured, for the want of employment of a means both simple and easy. 1. _The essence of wild thyme_, has been recently advantageously employed; in using it the feathers or hairs of an animal are to be raised every little distance by a long needle, and at their bases, that is to say, the skin, is to be touched by means of a hair pencil with a drop or two of the essence, and when this has been well imbibed, the hairs or feathers are to be replaced, their extremities, never being in contact with the liquor, cannot become tarnished. 2. _Essence of turpentine_ has been recommended by almost all authors, and yet, when made use of it is perceived with astonishment that great inconveniences result; it never dries upon the feathers, which it greases and soils in spite of every precaution, the spots spreading and enlarging like oil; besides this, it forms a species of glue, which arrests and fixes the dust in such a manner that no subsequent effort can remove.