the color of the flowers, and any other information which the
specimens themselves do not afford, should be duly recorded upon the
sheet or the ticket. The sheets of the herbarium should all be of
exactly the same dimensions. The herbarium of Linnaeus is on paper of the
common foolscap size, about eleven inches long and seven wide. This is
too small. Sixteen and three eighths inches by eleven and a half inches
is an approved size.

568. The sheets containing the species of each genus are to be placed in
_genus-covers_, made of a full sheet of thick paper (such as the
strongest Manilla-hemp paper), to be when folded of the same dimensions
as the species-sheet but slightly wider: the name of the genus is to be
written on one of the lower corners. These are to be arranged under the
orders to which they belong, and the whole kept in closed cases or
cabinets, either laid flat in compartments, like "pigeon-holes," or else
placed in thick portfolios, arranged like folio volumes. All should be
kept, as much as practicable, in dust-proof and insect-proof cases or
boxes.

569. Fruits, tubers, and other hard parts, too thick for the herbarium,
may be kept in pasteboard or light wooden boxes, in a collection apart.
Small loose fruits, seeds, detached flowers, and the like may be
conveniently preserved in paper capsules or envelopes, attached to the
herbarium-sheets.

Sec. 3. INVESTIGATION AND DETERMINATION OF PLANTS.

570. =The Implements= required are a hand magnifying glass, a pocket
lens of an inch or two focus, or a glass of two lenses, one of the lower
and the other of the higher power; and a sharp penknife for dissection.
With these and reasonable perseverance the structure of the flowers and
fructification of most phanerogamous plants and Ferns can be made out.
But for ease and comfort, as well as for certainty and right training,
the student should have some kind of simple stage microscope, and under
this make all dissections of small parts. Without it the student will be
apt to fall into the bad habit of guessing where he ought to ascertain.

571. The simple microscope may be reduced to a good lens or doublet, of
an inch focus, mounted over a glass stage, so that it can be moved up
and down and also sidewise, and with (or without) a little mirror
underneath. A better one would have one or two additional lenses (say of
half and of a quarter inch focus), a pretty large stage, on the glass of
which several small object