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Contents of Appendix: Sympathetic

Other Sympathetic Inks. 883 A Sympathetic Ink which appears by being wetted with water 884 Experiments with Sympathetic Ink.. 884 How to Write on Glass by means of the Rays of the Sun... 886 To produce different Colors, by pouring a colorless Liquor into a clean Glass To produce a Color which appears and disappears by the Influence of the Air To turn a colorless Liquor Black, by adding a White Powder to it...... 886 886 887 Freezing Mixture..... 887 Experiments with the Microscope... 887 Experiments with the Thermometer and Barometer... 891 Rules for judging of and predicting the State of the Weather by the Barometer. Method of Preserving Birds. 892 893 To take the Impression of the Wings of a Butterfly in all their Colors.. 894 To take the Impression of a Leaf of any Tree, Plant, or Shrub, with all its Veins....... 894 Experiments respecting Colors, etc...... 895 A Quantity of Eggs being broken, to find how many there were without remembering the Number... 898 To find the least Number of Weights, that will weigh from One Pound to Forty........ 898 A Number them of Metals being mixed together in one Mass, to find the Quantity of each of Number of Metals being mixed together in one Mass, to find the Quantity of each of them....... 899 ......

To make a mutual Exchange of the Liquor in two Bottles, without using any other Vessel 900 How to make a Peg that will exactly fit Three different Holes... 900 To place Three Sticks upon a Table in such a manner that they may appear to be unsupported by anything but themselves....... 901 How to prevent a heavy Body from falling, by adding another heavier Body to it on that side toward which it inclines 901 To make a false Balance that shall appear perfectly just when empty, or when loaded with unequal Weights....... 901 How to lift up a Bottle with a Straw, or any other slight Substance 902 To make a Pen, which holds One Hundred Sheep, hold double the Number, by only adding two Hurdles more.. 902 ...

How to make a Piece of Metal, or any other heavy Body, swim upon the Surface of Water like a Cork. 908 How to prove that Two and Two do not make Four.

Method of Secret Writing..

Optical Experiments....

How to make a violent Tempest by means of artificial Rain and Hail Magic Square.......