. The drug plants of Illinois . Drying drug plants in the open air. After the drug plants have been gathered, they are spread in thin layers in trays with wood sides and cloth or wire mesh bottoms. The loaded trays are then propped up so that air can circulate freely through them. They are placed where they will not be exposed to strong, direct sunlight throughout the day. Air drying permits the use of equipment that may be already available. (After United States Department of Agriculture Farmers' Bul- letin 1231.) ment necessary in handling many kinds in large lots. Drying is done by the use
. The drug plants of Illinois . Drying drug plants in the open air. After the drug plants have been gathered, they are spread in thin layers in trays with wood sides and cloth or wire mesh bottoms. The loaded trays are then propped up so that air can circulate freely through them. They are placed where they will not be exposed to strong, direct sunlight throughout the day. Air drying permits the use of equipment that may be already available. (After United States Department of Agriculture Farmers' Bul- letin 1231.) ment necessary in handling many kinds in large lots. Drying is done by the use either of natural air temperatures and movements or of artificially heated and circulated air. Of the two methods, the artificial is better, if properly controlled and if the quantity of crude drug material handled is sufficient to justify the cost of the necessary equipment. Air drying under natural conditions permits the use of equipment that may be already available and the exercise of some ingenuity. Roots, fruits, and other materials that may be dried in direct sunlight can be spread on clean boards, canvas, burlap, sheets, or paper on open ground, on shed roofs or drying floors exposed to the sun, or they can be spread in trays set in the open to face the sun. Herbs, leaves, and other parts that must not be exposed to direct sunlight can be spread on floors, cloth, or paper in shade furnished by large trees; they can be hung on wires in open sheds or in a well-ventilated part of a barn ; or they can be spread on slat- or mesh- bottomed shelves or trays in drying cabinets or buildings erected for the purpose. Particularly in the drying of whole herbs, hanging them on wires is a convenient and effective method, as suitable places for the wires can be found easily. A good arrangement is to string the wires so that they arc
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