with paraffin. It must then be closed for a moment above
and raised till the end is completely out of the water. Then if air is
allowed to enter slowly, and the tube is gently raised, bubbles of water
filled with paraffin will be formed which can be made to separate from
the pipe, like soap-bubbles from a "churchwarden," by a suitable sudden
movement. If a number of water-drops are floating in the paraffin in the
pipe, and this can be easily arranged, then the bubbles made will
contain possibly a number of other drops, or even other bubbles. A very
little bisulphide of carbon poured carefully down a pipe will form a
heavy layer above the water, on which these compound bubbles will remain
floating.

Cylindrical bubbles of water in paraffin may be made by dipping the pipe
down into the water and withdrawing it quickly without ever closing the
top at all. These break up into spherical bubbles in the same way that
the cylinder of liquid broke up into spheres of liquid.

_Beaded Spider-webs._

These are found in the spiral part of the webs of all the geometrical
spiders. The beautiful geometrical webs may be found out of doors in
abundance in the autumn, or in green-houses at almost any time of the
year. To mount these webs so that the beads may be seen, take a small
flat ring of any material, or a piece of card-board with a hole cut out
with a gun-wad cutter, or otherwise. Smear the face of the ring, or the
card, with a very little strong gum. Choose a freshly-made web, and then
pass the ring, or the card, across the web so that some of the spiral
web (not the central part of the web) remains stretched across the hole.
This must be done without touching or damaging the pieces that are
stretched across, except at their ends. The beads are too small to be
seen with the naked eye. A strong magnifying-glass, or a low power
microscope, will show the beads and their marvellous regularity. The
beads on the webs of very young spiders are not so regular as those on
spiders that are fully grown. Those beautiful beads, easily visible to
the naked eye, on spider lines in the early morning of an autumn day,
are not made by the spider, but are simply dew. They very perfectly show
the spherical form of small water-drops.

_Photographs of Water-jets._

These are easily taken by the method described by Mr. Chichester Bell.
The flash of light is produced by a short spark from a few Leyden-jars.
The fountain, or jet, should be five o