First wash the sea-weed in fresh water, then take a plate or dish (the larger the better), cut your paper to the size required, place it on the plate with fresh water, and spread out the plant with a good-sized camel-hair pencil in a natural form (picking out with the pin gives the sea-weed an unnatural appearance, and destroys the characteristic fall of the branches, which should be carefully avoided); then gently raise the paper with the specimen out of the water, placing it in a slanting position for a few moments, so as to allow the superabundant water to run off; after which place it in the press. The press is made with either three pieces of board or paste-board. Lay on the first board two sheets of blotting-paper; on that lay your specimens; place straight and smooth over them a piece of old muslin, fine cambric, or linen; then some more blotting-paper, and place another board on the top of that, and continue in the same way. The blotting-paper and the muslin should be carefully removed and dried every day, and then replaced; at the same timae those specimens that are sufficiently dried may be taken away. Nothing now remains but to write on each the name, date, and locality. You can either gum the specimens in a scrap-book, or fix them in, as drawings are often fastened, by making four slits in the page, and inserting each corner. This is by far the best plan, as it admits of their removal, without injury to the page, at any future period, if it be required either to insert better specimens, or interme-diate species. Some of the larger Algae will not adhere to the paper, and consequently require gumming. The following method of preserving them has been communicated to me by a botanical friend: - "After well cleaning and pressing, brush the coarser kinds of Algae over with spirits of turpentine, in which two or three small lumps of gum mastic have been dissolved, by shaking in a warm place; two-thirds of a small phial is the proper proportion, and this will make the specimens retain a fresh appearance.