3 3 3 - These are nine per side. Now if you / 3 a 3 - wish to take out 4 and still have 9 / 3 3 3 - remain per side, arrange them in the way drawn below in square c.

1 7 1 - Put 12 upon it and make the / 7 b 7 - same sides be 9 as / 1 7 1 - above.

1 / 1 / 1 1 1 / 1 / 1 / 1 1. The drawn cross has 5 per row. Take away 2, and let 2 rows remain at the same number. This is the way: 1 / 1 3 1 / 1. Distilled vinegar dissolves the shells of eggs; and dipping them in refined saltpetre mixed with burnt egg-shells ground fine, they regain their shell.

4 1 4 - This square has 9 numbers per side. Now I ask you whether it can be done that, 4 1 4 - adding to it a number of 12, the said square still remains 9 per side. Now arrange them in the manner of the square above marked b.

To twist any thick nail with your hands, wind two handkerchiefs onto its ends, one at the head and one at the point, with turns opposite to one another, and force them with your hands. Then the nail will twist and coil as much as you wish.

This supports itself in the air.

The light of a candle. There is a thing from which you may take as much as you can, yet its size will never diminish. Fire. Here is another which, the more wretched and evil it is, the more you draw near to it.

Striking a glass full of water with a catalana (Catalan sword), the said blade must break.

Once a glass is full of water, three lire of coins may be put into it; but they must be put in one by one and edgewise.

Fill two glasses with water and set them about an arm's length apart from one another, lay a cane across them and strike it with a club. I say the cane will break and the glasses will not spill.

Take a handkerchief and arrange it in the way you see drawn, over the flask, and set it upright. Then place a coin upon it and strike the said handkerchief with a club or knife: the coin drops into the flask.

A flask placed upside down in a basin of water, with a burning coal set on the bottom, that heat will have such power that it will draw the water upward and fill the said flask.

A way to make the chain of canes.

To drive any nail with a single blow of the hammer. Fix the head of the nail with wax to the face of the hammer, and strike hard, and it will be as said above.