With the exception of the Fuci or common rock-weeds, I never place seaweeds in _fresh_ water: with these, especially _Fucus serratus_, _F. nodosus_, _F. vesiculosus_, and _F. canaliculatus_, a few hours' immersion in fresh water is an advantage, as it soaks the salt out of their fronds and renders them more pliable. As all the Fuci turn black in drying, and few of them adhere well to paper, I arrange my specimens in single layers between the folds of a clean dry towel, and keep them under pressure until they are quite dry; they may then be put away loosely, or gummed on sheets of paper. The foregoing directions for mounting filamentous seaweeds are applicable to all the branching species of Olive, Red, and Green plants; but in each of the three subdivisions there are a few species which are so gelatinous--in fact, so soft and spongy, that they require the utmost care during pressure, otherwise they adhere to the calico and break off in fragments as it is drawn away. Such plants must be left to dry in a horizontal position for an hour or so before the calico and blotters are placed over them, and pressure must be very slight until they have adhered closely to the paper. Among the Chlorosperms, or green plants, there are the various species of Codium, young plants of which only are manageable or indeed desirable. In the Melanosperms, some species of the genus _Mesogloia_ will require care and patience in mounting, as well as the long string-like plant, known as _Chorda filum_; and again, the spreading tuberous mass called _Leathsia tuberiformis_, portions of which should be cut from the rock, the sand scraped and washed out, then laid on the wet paper, and allowed to shrink for some hours ere calico blotters and pressure be applied. These difficulties are much more numerous among the Rhodosperms, or red seaweeds, experience only teaching the best method of treatment. I will, however, mention the names of some very troublesome plants, the fronds of which, if subjected to pressure too soon, burst and discharge their carmine contents; not only presenting an unsightly appearance, but destroying the specimen. These are _Griffithsia corallina_, _Dudresnaia coccinea_, _Naccaria Wigghii_, all the _Chylocladia_, and the rare _Gloiosiphonia_, as well as the slimy worm-like plant known as _Nemalion multifidum_.