The Natural History of Selborne is not a treatise but a correspondence. It collects the letters Gilbert White, curate of the Hampshire village of Selborne, sent over many years to two fellow naturalists, Thomas Pennant and Daines Barrington. White rarely left his parish, and the book grows out of what he could see on foot within a few miles of his own door.
The opening letters describe the place itself: the chalk hill and the beech hanger above the village, the soils, the springs, the single straggling street. From this fixed vantage White turns to the living things around him. He watches the comings and goings of summer birds, lists when each species arrives and departs, and records the habits that let him tell one small warbler from another by its note alone.
A long thread running through both series of letters is the question of where swallows, martins, and swifts go in winter. White cannot decide between migration across the sea and a hidden torpid sleep at home. He collects every account he can, sifts the secondhand stories he distrusts, notes the late broods and odd sightings, and keeps the question open rather than forcing a conclusion the evidence will not support.
Other letters fix on a single subject and follow it closely. He keeps and observes an old land-tortoise, marveling that so long-lived a creature should sleep away most of its existence. He defends the earthworm as a quiet maker of fertile soil. He measures the echo from a nearby wood by experiment, times its syllables, and notes the weather that helps or deadens it. The same steady attention falls on field crickets, swifts, fieldfares, and the antiquities of the parish.
What holds the book together is less a system than a temperament. White is exact, modest about the narrow sphere of his own observations, and unwilling to claim more than he has seen. His example became a quiet argument that careful, local, firsthand watching, kept up year after year, is itself a form of science, and that a single parish closely known can repay a lifetime of study.