A beautiful marine plant is the _Delesseria sanguinea_, with its beautiful scarlet leaves, the branches being five or six inches in length. It has a very “ancient and fish‐like smell,” once noticed not to be forgotten. Then again every one will remember in the little seaweed bouquets and landscapes on card sold at the fashionable seaside watering‐places, a gay, bright, pinky‐red kind, which is sure to be remarked for its charming beauty. This is the _Plocamium coccineum_, which is found to be even more beautiful under the microscope, for it is there seen that even the tiniest branchlets, themselves hardly thicker than a hair, have each their rows of finer branches. Some seaweeds are eaten, as for example the so‐called “Carrageen,” or Irish moss, which is used in both jelly and size, and is one of the _Rhodosperm_ algæ. To preserve it for esculent purposes it is washed in fresh water and allowed to dry; it becomes then horny and stiff. If boiled it subsides into a thick jelly, which is considered nutritious, and is used by both invalids and epicures. Calico‐printers use it for size. It is used, boiled in milk, to fatten calves. A pretty little seaweed, _Griffithsia selacea_, has the property of staining paper a fine pinkish‐scarlet hue when its membrane bursts. Contact with fresh water will usually cause the membrane to yield, and then the colouring‐matter is exuded with a slight crackling noise. The _Chlorosperms_, or green‐seeded algæ, have the power of pouring out large quantities of oxygen under certain conditions, and are therefore very valuable in the aquarium. Among them are the sea‐lettuce, before mentioned, the common sea grass, and a large number of smaller and more delicate forms. “If,” says Mr. Wood, “the naturalist wishes to dry and preserve the algæ which he finds, he may generally do so without much difficulty, although some plants give much more trouble than others. It is necessary that they should be well washed in fresh water, in order to get rid of the salt, which, being deliquescent,(53) would attract the moisture on a damp day, or in a damp situation, and soon ruin the entire collection. When they are thoroughly washed the finest specimens should be separated from the rest and placed in a wide, shallow vessel, filled with clear fresh water. Portions of white card, cut to the requisite size, should then be slipped under the specimen, which can be readily arranged as they float over the immersed card. The fingers alone ought to answer every purpose, but a camel’s‐hair brush and a needle will often be useful. When the specimen is properly arranged the card is lifted from the water, carrying upon it the piece of seaweed. There is little difficulty in getting the plants to adhere to the paper, as most of the algæ are furnished with a gelatinous substance which acts like glue and fixes them firmly down.” If not, the use of hot water will generally accomplish the desired end. Animal glue or gum‐water cannot he recommended.