The spider makes its cobweb according to the weather, both the present and the future weather. Looking at a spider, you can tell what kind of weather it is going to be: if it sits tightly in the middle of the cobweb and does not come out, it means that it is going to rain. If it leaves the nest and makes new cobwebs, it is going to clear off.
How can the spider know in advance what weather it is going to be?
The spider's senses are so fine that as soon as the moisture begins to gather in the air,—though we do not yet feel it, and for us the weather is clear,—for the spider it is already raining.
Just as a naked man will feel the moisture, when a man in his clothes does not, so it is already raining for a spider, while for us it is only getting ready to rain.
II.
Why do the doors swell in the winter and close badly, while in the summer they shrink and close well?
Because in the fall and winter the wood is saturated with water, like a sponge, and spreads out, while in the summer the water comes out as a vapour, and the wood shrinks.
Why does soft wood, like aspen, swell more, and oak less?
Because in the hard wood, in the oak, the empty places are smaller, and the water cannot gather there, while in the soft wood in the aspen, there are larger empty places, and the water can gather there. In rotten wood these empty places are still larger, and so rotten wood swells most and shrinks most.
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.