Snails in myth, medicine, and the kitchen

Snails have been food for a long time. Roman writers describe the fattening of land snails, and modern escargot is usually the Roman snail, Helix pomatia, or the garden snail, Cornu aspersum, raised on a farm. The farming is the part that matters. A wild snail may have crossed a bait pellet, accumulated whatever was in the soil, or picked up parasites. A farmed snail is fed for the table and purged before cooking. The two are not substitutes. A cookbook that opens by sending the reader to collect a hundred snails from the hedge is advice from a century with fewer pesticides, and it is bad advice in this one.

The same animals collected a long medical reputation, much of it wishful. Traditional recipes used mucus, burnt shell, or the whole body for complaints that the snail’s slowness, or the shape of its house, did not in fact cure. Some modern cosmetics use filtered mucins. Those are real molecules with real effects on water at a surface, and they are sold well beyond the evidence for any particular jar. Ground shell is calcium carbonate, like other shells, and people have used it wherever lime was scarce. None of this needs a mystical animal. It needs a mollusc that is common and easy to pick up, which a snail is.

Stories collect around the slowness and around the spiral. A shell approximates a logarithmic spiral, the curve that keeps its shape while it grows, which is why new shell can be added at the lip without rebuilding the tip. Retellings often promote the spiral to a Fibonacci sequence. Fibonacci spirals are a special case that looks similar, and real shells vary from whorl to whorl. The geometry is worth looking at on an empty shell from the thrush’s anvil. It does not need the extra myth to be exact.

What remains, in the garden, is a reputation: caution, a house carried along, an animal that will not be hurried. The reputation is fair. The snail earned it by being edible, observable, and metabolically uninterested in our timetable.