There are families of plants that require peculiar processes of preservation. Palms, on account of their size, cannot be preserved in common herbals. Yet, it is important to complete the history of this remarquable family. For this, must be preserved:--1º The dried leaves in paper spread out, when they are not too large; folded like a fan, dried in the air and wrapped in brown paper well tied, when they are large.--2º Clusters of flowers or carymbs with the common envelope, taking care to preserve equally the male and female flowers, when they are separate; they should be dried quickly in the open air and wrapped in paper or cloth, taking care to collect the flowers that fall of. When these clusters are not large, it would be well to preserve them in weak alcohol, and, in all cases, it should be used for branches to be put in the same jar with ripe fruits of the same plant.--3º Clusters of ripe fruits dried in the air and other fruits in alcohol. Those great marine plants, commonly known by the name of sea-weed, should be dried by hanging them in the shade, in the open air, without pressing them in paper; they should, afterwards, be put in paper bags, with a label of the place where they were collected and their color when fresh. They can be better prepared in Paris than in travelling, as they often require much care, unless the traveller is skilled in the art. Samples preserved in alcohol would be useful for anatomical researches. Before drying the small kind in the same manner in the open air, all the sea water should be pressed out, by squeezing them gently, and absorbing it with brown paper. The most of the other criptogamous plants, such as the fern, mosses, lichens, mushrooms large and small, are prepared in herbals as other vegetables. The only proper way to preserve the pulpy mushroom is alcohol, or wrapping them in flax or cotton; but a note or sketch should be made of their colors, for only their form and structure are thus preserved. Young specimens of these plants are preferable. However the collections we have spoken of are made, a label should be attached to each of the specimens indicating: 1º The place where the plant was found, and if the place is little known, its position with relation to one that is; 2º The time of the gathering of the specimens, whether in flower or fruit; 3º The name the plant bears, taking care to have it repeated several times, and its meaning should be added, whenever it is known; 4º The uses of the plant in domestic economy, the arts or medicine; 5º The color of the different parts and particulary that of the flower, its odor, the consistence of the fruit, and the manner it opens, when ripe; in fine, all the phenomena relative to the plant;