Beehives are made out of the softest and rottenest wood; the very best are made from rotten willow wood. Why? Because the air passes through the rotten wood, and in such a hive the bees feel better. Why do boards warp? Because they dry unevenly. If you place a damp board with one side toward the stove, the water will leave it, and the board will contract on that side and will pull the other side along; but the damp side cannot contract, because it is full of water, and so the whole board will be bent. To keep the floors from warping, the dry boards are cut into small pieces, and these pieces are boiled in water. When all the water is boiled out of them, they are glued together, and then they never warp (parquetry). THE DIFFERENT CONNECTION OF PARTICLES Why are cart bolsters cut and wheel naves turned not from oak, but from birch? Bolsters and naves have to be strong, and oak is not more expensive than birch. Because oak splits lengthwise, and birch does not split, but ravels out. Because, though oak is more firmly connected than birch, it is connected in such a way that it splits lengthwise, while birch does not. Why are wheels and runners bent from oak and elm, and not from birch and linden? Because, when oak and elm are steamed in a bath, they bend and do not break, while birch and linden ravel in every direction. This is again for the same reason, that is, that the particles of the wood in the oak and in the birch are differently connected. CRYSTALS If you pour salt into water and stir it, the salt will begin to melt and will entirely disappear; but if you pour more and still more salt into it, the salt will in the end not dissolve, and no matter how much you may stir after that, the salt will remain as a white powder. The water is saturated with the salt and cannot receive any more. But heat the water and it will receive more; and the salt which did not dissolve in the cold water, will melt in hot water. But pour in more salt, even the hot water will not receive it. And if you heat the water still more, the water will pass away in steam, and more of the salt will be left. Thus, for everything which dissolves in the water there is a measure after which the water will not dissolve any more. Of anything, more will be dissolved in hot than in cold water, and in each case, when it is saturated, it will not receive any more. The thing will be left, but the water will go away in steam. If the water is saturated with saltpetre powder, and then more saltpetre is added, and all is heated and is allowed to cool off without being stirred, the superfluous saltpetre will not settle as a powder at the bottom of the water, but will all gather in little six-edged columns, and will settle at the bottom and at the sides, one column near another. If the water is saturated with saltpetre powder and is put in a warm place, the water will go away in vapours, and the superfluous saltpetre will again gather in six-edged columns.