the stamps issued. Numerous illustrated catalogues are issued by
the principal dealers in this country and Europe.

J.H.S.--1. When recharging a battery it is only necessary to remove
any parts that may have decomposed and then add water. 2. The outfit
requisite for producing the electric light described in Nos. 1 and 2 of
the last volume will cost two or three dollars.

OLD SUBSCRIBER.--Narrow shoulders may be strengthened and straightened
by judicious exercise, and by walking and sitting erect, throwing them
well back and never allowing them to droop. It is very doubtful,
however, if their breadth can be increased to any appreciable degree.

H.B.--Vols. 1, 2, 3 and 4 of this paper cannot be furnished complete
either bound or unbound, but from 6 to 12, inclusive, they can be
supplied in either shape. A very limited number of bound copies of the
fifth volume remain to be sold at the usual rate of $4 each, but in its
unbound form it is incomplete, one number being out of print.

E.F.W.--White ink is made by mixing flake white with gum arabic and
water. It should be sufficiently fluid to flow easily from the pen.
Another mixture, erroneously called white ink, but which is in reality
an etching fluid, and can only be used on colored paper, is made by
adding 1 part of muriatic acid to 20 parts of starch water. A steel pen
must be used.

A.G.D.--1. There is but one way to improve the memory, and that is to
concentrate the mind upon but one subject at a time, never allowing it
to wander off to some other idea. At first, this is a difficult matter,
but in a comparatively short time the mind can be brought under control,
and the memory will, in many instances, become far more retentive than
ever before. 2. The growth of hair on the face cannot be checked, but
can be controlled by the regular use of a razor.

UNUS PLURORUM.--Pilot charts may be obtained at all the branch
hydrographic offices in our large ports, but the coast survey charts
are not intended for general distribution. Every Congressman is allowed
a limited number, and may, if he pleases, distribute them among his
friends, and they are also furnished to schools, scientific
associations, libraries and the like, when application is made for any
special map. In all other cases they are for sale at stated figures,
varying according to the size of the chart desired. A catalogue of all
the maps issued by the Coast Survey is procurable from the chief of that
office i