《淮南子·地形训》
土地各以它们不同的品类而影响着所出产的物品。因此，山中云气多而使人生男孩，沼泽雾气多而使人多生女婴；湿热瘴气多使人喑哑，邪恶风气多使人耳聋；森林之气重使人腿瘸，木林之气重使人背驼，河岸之气重使人脚肿；居岩石地区的人力气大，险阻地区的人易患粗脖子病；暑热之气使人命短，寒冷之气助人长寿，山谷之气吹多使人肢体麻痹，丘陵之气吹多使人骨骼弯曲；平衍之气教人仁爱，土山之气诱人贪婪。
土地各以其类生，是故山气多男，泽气多女；障气多暗，风气多聋；林气多癃，木气多伛；岸下气多肿，石气多力；险阻气多瘿：暑气多夭，寒气多寿；谷气多痹，丘气多狂；衍气多仁，陵气多贪。
The land affects the products it produces due to its different types. Therefore, the mountain clouds are more likely to give birth to boys, and the marsh fog is more likely to give birth to girls; the damp and hot miasma often makes people dumb, and the evil winds often make people deaf; the forest makes people lame, and the woods make people hunchbacked, the river bank air makes people's feet swell; people living in rocky areas are strong, and people living in rugged areas are prone to goiter; the heat makes people short-lived, while the cold helps people live longer; the valley air often causes people's limbs to become numb, the hill air often makes people's bones彎曲；平衍之气教人仁爱，土山之气诱人贪婪。