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- The Leech A Prognosticator Of The Weather
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- To Fill A Bladder With Hydrogen Gas
- To Make Several Rockets Rise Together Take Six Or Any Number Of
- To Melt Iron In A Moment And Make It Run Into Drops
- To Extract The Silver Out Of A Ring That Is Thick Gilded So That The
- There Must Also Be A Glass Planned To Rise Up And Down In The Groove A B And So Managed By A Cord And Pulley C D E F That It May
- To Tell How Many Cards A Person Takes Out Of A Pack And To Specify
- The Power Of Water When Reduced To Vapour By Heat

Winter Changed To Spring

Take a print that represents winter, and colour those parts which
should appear green, with the second green invisible ink, described in
page 25; observing, of course, the usual rules of perspective, by
making the near parts deeper in colour than the others. The other
objects must be painted in their natural colours. Then put the print
into a frame with a glass, and cover the back with a paper that is
pasted only at its extremities.

When this print is exposed to a moderate fire, or the warm sun, the
foliage, which appeared covered with snow, will change to a pleasing
green; and if a yellow tint be thrown on the lighter parts before the
invisible ink is drawn over it, this green will be of different
shades. When it is exposed to the cold, it will again resume its first
appearance of winter.

Next: The Silver Tree

Previous: The Restored Flowers

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