ed not be confined to seeds
alone, but small flowers, earth, chemicals, insects, and the
thousand and one little things of daily life--all make beautiful
subjects for enlarged photographs. These cannot be made by taking
an ordinary photograph and enlarging through a lantern. When a
gelatine dry plate is magnified nine diameters, the grains of
silver in the negative will be magnified also and produce a result
that will not stand

[Illustration: Magnified Nine Diameters]

close examination. Photographs made by photomicrography can be
examined like any other photographs and show no more texture than
will any print.

** Steel Pen Used in Draftsman's Ink Bottle Cork [117]

A steel pen makes an ideal substitute for a quill in the stopper
of the draftsman's ink bottle. The advantage of this substitute is
that there is always one handy to replace a broken or lost pen,
while it is not so with the quill.
--Contributed by George C. Madison, Boston, Mass.

** How to Make a Pilot Balloon [118]
By E. Goddard Jorgensen

Unusual interest is being displayed in ballooning, and as it is
fast becoming the favorite sport many persons would like to know
how to construct a miniature balloon for making experiments. The
following table will give the size, as well as the capacity and
lifting power of pilot balloons:

Diameter. Cap. in Cu. Ft Lifting Power.
5 ft. 65 4 lb.
6 ft. 113 7 lb.
7 ft. 179 11 lb.
8 ft. 268 17 1b.
9 ft. 381 24 lb.
10 ft. 523 33 lb.
11 ft. 697 44 lb.
12 ft. 905 57 lb.

The material must be cut in suitable shaped gores or segments. In
this article we shall confine ourselves to a 10-ft. balloon. If
the balloon is 10 ft. in diameter, then the circumference will be
approximately 3-1/7 times the diameter, or 31 ft. 5 in. We now
take one-half this length to make the length of the gore, which is
15 ft. 7-1/2 in. Get a piece of paper 15 ft. 7-1/2 in. long and 3
ft. wide from which to cut a pattern, Fig. 1. A line, AB, is drawn
lengthwise and exactly in the middle of the paper, and a line, CD,
is drawn at right angles to AB and in the middle of the paper
lengthways. The intersecting point of AB and CD is used for a
center to ascribe a circle whose diameter is the same as the width
of the paper, or 3 ft. Divide one-quarter of the cir