. Bulletin of the Department of Agriculture. Agriculture. FUMIGATION OF ORNAMENTAL GREENHOUSE PLANTS. 3 with straight sides are frequently sold with glazed earthenware tops. These tops or covers increase the cost of the generators and, further- more, are useless for fumigation purposes. Therefore, when genera- tors are ordered it should be indicated that tops are not desired. With this type of generator a cover may be improvised by using a piece of corrugated galvanized iron roofing or a board with cleats on the underside, to allow the free exit of gas. MISCELLANEOUS REQUIREMENTS. Correct
. Bulletin of the Department of Agriculture. Agriculture. FUMIGATION OF ORNAMENTAL GREENHOUSE PLANTS. 3 with straight sides are frequently sold with glazed earthenware tops. These tops or covers increase the cost of the generators and, further- more, are useless for fumigation purposes. Therefore, when genera- tors are ordered it should be indicated that tops are not desired. With this type of generator a cover may be improvised by using a piece of corrugated galvanized iron roofing or a board with cleats on the underside, to allow the free exit of gas. MISCELLANEOUS REQUIREMENTS. Correct scales or balances, reading in tenths of an ounce, are con- venient for accurate work. An 8-ounce graduate is desirable for measuring the acid and water. To avoid splashing of the acid it should not be poured from a carboy or bottle into the graduate but should be transferred to a porcelain pitcher, from which it may be poured with safety. It is well to have on hand a supply of small bags or tissue paper in which to place the cyanid. PREPARATION OF HOUSE FOR FUMIGATION. As a preliminary to fumigating the house it is essential that the exposed glass surface be examined carefully and all broken glass re- placed. All cracks should be thoroughly closed. The ventilators,. Fig. 2.—Methods of attaching rod and cord (a, t>) to ventilator shaft of greenhouse so that the ventilators can be opened from the outside after fumigation. (Original.) both side and top, where possible, should be so arranged that they can be opened on the outside of the house upon the completion of the exposure. This can be accomplished by disconnecting the " machine," or gear, of the top ventilators and attaching to the central ventilator shaft (see fig. 2) an arm (a or b) which can be controlled by a cord or wire which extends through the side of the house. The gears on the side ventilators may be disconnected so that the sash may be opened from the outside. If only one ventilator can be opened i
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