CHAP. XIX. To make an Addition before the Figures are
set, by knowing only how many Figures are in each
Row; as likewise how many Rows compose the whole; and
then adding yourself some Figures equal to those that
had been set 38
CHAP. XX. An artificial Spider, which moves by
Electricity 42
CHAP. XXI. To extinguish two Wax Candles, and light two
others, distant about three Feet, by the firing of a
Pistol, loaded with Powder, as usual 43
CHAP. XXII. To compose a red Colour, imitating the
Colour of Blood 44
CHAP. XXIII. To extinguish a Wax Candle, at eighty or
a hundred Paces distance, by firing a Gun loaded
with Ball, and to be certain of not missing, however
unskilful may be the Marksman 47
CHAP. XXIV. To cut a Glass, a Looking-glass, or even a
Piece of Crystal, let it be ever so thick, without
the Help of a Diamond, in the same Shape as the Mark
of the Drawing made on it with Ink 49
CHAP. XXV. To melt a Piece of Steel, as if it was lead,
without requiring a very great Fire 50
CHAP. XXVI. To unite Wax and Water, (Things absolutely
opposite to each other); this Union, made in the
twentieth Part of a Minute, forms a good Pomatum to
clean the Skin, and render it soft and white. It is a
fine Cosmetic 52
CHAP. XXVII. A curious Method of sealing a Letter, so
as not to be opened, by variegating the Seal with
different coloured Species of Wax 53
CHAP. XXVIII. To make fine blue Wax, which is very
difficult to be had 54