It is desirable that flowers too delicate or too pulpy to be easily analysed when dry should be, also, sent in flasks of weak alcohol or acetic acid much weakened with water; such are those of the Orchides, Balisiers, Aroides, Asclepiades, and all other plants difficult to preserve in herbals. It is important to tie on the flask a label marked with the name of the plant, or at least, a number corresponding to that which bears in the herbal the sample of the plant to which the sample belongs. Labels on jars frequently falling off, it would be best to mark these jars with paint, or to put in each jar a bit of wood or parchment bearing the number, or a label written with crayon or ink, if the objects are in alcohol, or on thin pieces of lead marked with a knife. When several plants are put in the same jar, a label, thus marked, should be attached to each. Without this precaution, the collection is useless. Flowers of the different species should not be put in the same viol. If it is ever necessary, a label should be attached to each. Or they should be put in paper pasted together, with the necessary specifications on the envelope. If there is neither viol nor alcohol, the flowers may be dried in the air without pressing, and then folded in paper and labelled; care should be taken to put them up, so that there may be no danger of pressure. Entire specimens in flower and fruit of parasites with their roots and the root in which they are imbedded should be preserved in alcohol, or vinegar, or salt-water. Males and females of these plants, in which the sexes are generally separated, should be collected. These plants are generally remarkable for the absence of leaves, for their pulpy consistence and creeping character. Herbals and fruits, when perfectly dry, should be put in tin, or, at least, well painted boxes so as to be beyond the reach of mice or insects. Leaves of paper containing plants, should be well pressed together in packets and placed between two sheets of plain paper, before being put in boxes. In packing up, several samples may be placed between each leaf of paper, and the number of leaves placed between be lessened, if necessary; the packets should always be well pressed together. Any kind of paper is good for packing; bananas or any large-leafed plant can replace it; it is only necessary that the plants should be arranged with care, so as to give an equal thickness to the packets in all their parts. If there is time the specimens should be preserved by plunging the dry plant in an alcoholic solution of corrosive sublimate (15 to 20 grammes for a litre of alcohol at 36 deg.), or to rub it with a pencil, then to dry it in a leaf of paper, which requires but a few instants. With this precaution, all the specimens sent may be preserved; and for not making use of it, several parcels of plants have arrived damaged by insects. If the plants are fumigated with sulphur, they will be preserved from insects for a long time.