148 BOTANICAL GAZETTE. [ June, 
rejectamenta upon the beaches, or watching for them in the waves of the in- 
coming tides. 
11 but the coarser forms, like the Fuci and Laminaria, are mounted 
by “floating out” on paper and dried in a press. The paper best adapted to 
the purpose is a good quality and weight of demy or some lighter kinds of 
drawing paper. It should be cut in three or four regular sizes by dividing 
the sheets into quarters, eighths, sixteenths, etc. 
A simple and handy apparatus for floating out the plants consists of a 
shallow tin dish, which may be had at any tin shop, 8 by 11 inches, and 1 inch 
deep, and a plate of zine 124 by 63 inches, perforated by six rows of half-inch 
holes, an inch and a half apart in the rows, the perforations extending over only 
about 10 inches of the plate. Fill the dish three-quarters full of sea water, 
wet the paper and lay it on the zinc, thrust both into the water and luy on the 
plant. Spread it out carefully, lift up the end of the zinc which will draw the 
paper and plant out of the water. Let it drain a moment and then remove to 
the press. Lay the paper, plant up, on a sheet of drying paper. Spread a piece 
of old cotton over the plant, and over this put a sheet of drying paper. An- 
other floated out plant, cotton, drying-paper, and so on. Put in press for 24 
hours. Change the cloths and drying paper and put in press, under more pres- 
strips of gummed paper. The Laminaris and Fuei, and such like coarse forms, 
shoul partly dried before putting in press. It is well also to wash them in 
fresh water, and such as will bear it to soak them out in fresh water, to get as 
much of the salt as possible out of them. These plants are arranged in the 
herbarium in the usual way.—A. B. Hervey. 
FRESH-WATER ALG®.—They should be looked for in ponds, quiet or slug- 
gish waters, in swampy grounds with pits which retain water during the sum- 
mer months, mountain ravines with cascades, moist, shaded and dripping 
rocks, and sheltered angles of lakes and rivers. The equipments may be sim- 
in the vials. If a larger vessel is at hand dip the material into it, allow it to 
settle, drain off the water and bottle the thicker substance. The bottled mate- 
rial will become fetid after several days, but it may be preserved for months 
and even years by the addition of a few drops of carbolic acid, just enough to 
make its presence perceptible. It may be well to bear in mind that the freshest 
and brightest green forms are not usually the most desirable. Among the older 
and more unsightly more mature and fruiting specimens may be found.— 
Francis Woutue. 
(Desmipre%).—Unlike their near relatives the diatoms, which 
? 
may be found in greater or less quantities in all waters, desmids are select and 
