This section is from the book "The Gardener's Monthly And Horticulturist V22", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
The Gardener's Chronicle says: " From concurrent ther-mometric observations made in forests and away from them, at 1.40 and at 14 meters above the ground level, M. Fautrat arrives at the following conclusions. In consequence of the differences of temperature which are observed underneath the foliage and above the summits of trees, a current of air from below upwards is established in forests, and also lateral currents around woods from the foliage towards the open space beyond. These currents cause a healthy breeze in hot weather. The ascending current carries off above the forests the vapors from the soil, puts this latter in communication with the clouds, and fills the office of a lightning conductor; and it is to this, no doubt, that forests owe their remarkable property of keeping hailstorms at a distance".