. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 2 BULLETIN 513, U. S. DEPAETMENT OF AGEICULTUEE. vailing impression that fumigation is a cumbersome procedure requir- ing considerable skill on the part of the operator. While it is true that much damage to the plants and injury to the operator may result from the cat'eless use of hydrocyanic-acid gas, it is an estab- lished fact that this fumigant in competent hands is a safe, prac- tical, and economical means of controlling virtually all insect pests found in greenhouses. EQUIPMENT NECESSARY FOR FUMIGATION. GENERATOR
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 2 BULLETIN 513, U. S. DEPAETMENT OF AGEICULTUEE. vailing impression that fumigation is a cumbersome procedure requir- ing considerable skill on the part of the operator. While it is true that much damage to the plants and injury to the operator may result from the cat'eless use of hydrocyanic-acid gas, it is an estab- lished fact that this fumigant in competent hands is a safe, prac- tical, and economical means of controlling virtually all insect pests found in greenhouses. EQUIPMENT NECESSARY FOR FUMIGATION. GENERATORS. One-half gallon or one-gallon glazed earthenware jars serve as ,satisfactory generators, although it is preferable that the bottoms of the jars be rounded in- side, so that the cyanid will •be covered with the acid and water, even with small doses, thus insuring the maximum generation of the gas. The number of gener- ators required is largely influenced by the size of the house or houses to be fumigated, and to avoid unnecessary delay in case of breakage several extra crocks should be available. To insure uniform distri- bution of the gas it is ad- visable to employ gener- ators with covers, such as that illustrated in figure 1. This cover, which was de- signed by Mr. E. S. Wog- lum,^ is made of copper stamped in a concave form with corrugations to permit the escape of the gas. It is attached to the generator by hinges and held in place by a bolt which extends through the handle and can be raised by a slight pressure of the thumb as shown in the figure. If it is not possible to secure crocks of this description, those with straight sides which are not constricted inside at the bottom can be use'd with good results, although to insure complete generation such a crock should be tilted slightly in order that the cyanid may be covered. Crocks. Fig. 1.—A cover device attached to a fumigation generator. Corrugations in cover allow gas to escape. (Woglum.) 1 Bui. 79, Bur. Ent.,
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