. Bulletin. Agriculture. 20 THE PRODUCTION OF VOLATILE OILS AND PERFUMERY PLANTS. ff-'^ trays, A^ B^ C^ Z>, and E, which also have brass or tinned-iron screens of rather coarse mesh for bottoms. The sides, fronts, and backs of trays may be of wood. The trays may readily be placed in or taken out of the absorption box when refilling is necessary. Immediately above the flower trays are located a series of glass plates so con- structed that they may be readily taken from the box and replaced. The absorbing medium, lard or other solid fat, is spread in a layer about one-half inch in thickness u
. Bulletin. Agriculture. 20 THE PRODUCTION OF VOLATILE OILS AND PERFUMERY PLANTS. ff-'^ trays, A^ B^ C^ Z>, and E, which also have brass or tinned-iron screens of rather coarse mesh for bottoms. The sides, fronts, and backs of trays may be of wood. The trays may readily be placed in or taken out of the absorption box when refilling is necessary. Immediately above the flower trays are located a series of glass plates so con- structed that they may be readily taken from the box and replaced. The absorbing medium, lard or other solid fat, is spread in a layer about one-half inch in thickness upon each glass plate, which is i:)laced in its proper position. The front portion of the apparatus must be supplied with a tight-fitting door (not shown in the illustration) capable of being opened or re- moved to admit of charging and discharging the fat and flowers. When the flower trays have been charged with the freshly picked flowers and the door closed firml}^ a current of air is made to pass upward through the sponges and the flowers and the lard-laden tray, a more efficient circulation being pro- duced by the alternating arrangement of glass plates. The odor-bearing air as it passes over the lard readily surrenders its perfume, which can be subsequently ex- tracted from the lard. A small fan may be placed at the top of the apparatus or a blower at the bottom to produce the required movement of the perfume-laden air. The current should be regulated so that absorp- tion is completely effected in its upward journey. When retained in fresh condition, flowers hold their aroma and even secrete perfume for a longer period of time than if allowed to wilt and dry; hence the moistened sponges in the bottom of the apparatus. Some flow- ers are even known to continue to secrete perfume if left in moistened air. The air drawn through the apparatus is moisture laden and therefore produces the best yield of perfume from the flowers. The oi^eration of the above contrivance may be conti
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