I remember when I was a child, every autumn, when the sky was unknown, the girls in my hometown would quietly go to the field with a bottle in their hands, put the dew attached to the petals and grass blades into the bottle, and take it home to wipe their faces and eyes, saying that it can beautify and brighten their eyes. This is the custom of white dew: to harvest clear dew.
Dew refers to the liquid water in the air where the water vapor condenses on the ground objects, and it occurs all year round, and the dew is the most in the white dew season. Because the formation of dew depends on two factors, namely clouds and wind. If the sky is cloudy at night, the ground is like a black quilt, after the heat touches the clouds, part of it returns to the earth, and the other part is absorbed by the clouds, and this part of the heat absorbed by the clouds will slowly radiate to the ground in the future, so that the temperature on the ground is not easy to drop, and it is difficult for dew to appear; If the wind is strong at night, the wind can speed up the air exchange between the upper and lower air, increase the temperature of the air near the ground, and make it difficult for water vapor to spread, and it is difficult for dew to form. Therefore, dew can only be formed when the sky is high and the clouds are light, and the wind is refreshing. The White Dew solar term can reach such weather.
Du Fu has a poem that says: "The dew is white tonight, and the moon is the hometown of Ming." "As soon as the white dew arrives, the mid-autumn season begins. At this time, people will clearly feel that the heat is quietly gone, the weather is gradually getting cooler, and the autumn is crisp. "After the White Dew Festival, the night is cold and the day is hot." In the white dew season, the temperature difference between day and night can reach more than ten degrees, the yang energy gradually recedes, and the yin energy increases. As the saying goes: "Eighteen pots in the summer, don't show your body in white dew." It means that after the heat, due to the "autumn tiger" weather, people still have to take a bath at night to cool off, and when it comes to Bailu, they can't be shirtless and bareback sooner or later, so as not to catch a cold. "White dew autumn wind night, one night cool one night." The night during the white dew period is clear and cloudless, the ground temperature drops rapidly, the ability of the air to contain water vapor decreases, and the water vapor in the lower layers of the atmosphere attaches to the flowers and leaves, condensing into a layer of petite and delicate, white and crystal water droplets, that is, white dew. "Seventy-two Candidate Explanations of the Moon Order" says: "Water and soil moisture condense into dew, autumn is golden, golden white, white is the color of dew, and the air is cold."
In ancient times, people believed that dew was a treasure and divine water that fell from the sky, so many rural langzhong and alchemists paid attention to collecting dew and using it to cure all kinds of diseases and practice the "elixir of immortality". In some places, some people use porcelain to collect the dew of grass, and use cinnabar or high-quality ink to dye children's foreheads and hearts, which is called heavenly burning, in order to dispel all kinds of diseases. Li Shizhen said in the "Compendium of Materia Medica: Water Department" that the smell of dew is sweet, flat and non-toxic. Especially when the autumn dew is heavy, go to the flowers and plants to collect, and use it to decoction to moisten the lungs and kill insects, or to adjust the powder for the treatment of scabies and worms into external medicine, which can enhance the curative effect. Dew on different flowers and plants also has different effects, "White Flower Dew: Quenching thirst." Potpourri: Makes the skin healthy. Cypress leaf dew, calamus dew: Washing your eyes every morning can enhance your eyesight. Leek leaf dew: treatment of vitiligo. Apply to the affected area every morning. The famous Qing Dynasty physician Wang Shixiong's book on food therapy and health care "Suixingju Diet Recipe" contains: "The rice head is dewed, nourishing the stomach and nourishing; Calamus dew, clear heart and eyes; The leek is dewed, cooling the blood and stopping choking; The lotus leaves are dewed, refreshing in the summer; Chrysanthemums dew, nourishing blood and wind. ”
The ancients had the saying that "autumn dew is like a pearl". Dew, like rain, moisturizes the soil and promotes plant growth. And it has the effect of sunshine, rain and dew, moisturizing things silently, crops have strong photosynthesis during the day, a large amount of water will evaporate, and the stems and leaves will undergo slight wilting. At night, due to the moisture of the dew, it will regain its vitality, which is conducive to the transformation of the accumulated organic matter. Du Mu has a poem: "The dawn welcomes the autumn dew with a new branch, and it does not occupy the most spring in the garden." ”
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Author: A Zheng Editor: Zhang Li Editor: Liao Jiwei
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