. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 24 For an ordinary houne or frame, good vessels for lil)erating the gas are Ij or 2 gallon earthen jars of as small diameter as possible, so as to insure the immersion of the cj'anide of potash when it is dropped into the acid. One jar should l)e used to about every 50 feet in length of such houses as described, in order that the gas may be quickly distributed when set free. When the jars are placed in position the next step is to arrange to lower the paper bags containing the desired amount of cyanide into the j
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 24 For an ordinary houne or frame, good vessels for lil)erating the gas are Ij or 2 gallon earthen jars of as small diameter as possible, so as to insure the immersion of the cj'anide of potash when it is dropped into the acid. One jar should l)e used to about every 50 feet in length of such houses as described, in order that the gas may be quickly distributed when set free. When the jars are placed in position the next step is to arrange to lower the paper bags containing the desired amount of cyanide into the jars, from the outside. This is best done by passing a cord through a hook or screw-eye attached to the roof over each jar in such a manner that when the string or strings are loosened from the outside the bags of cyanide will Ijb lowered into their respective jars, as shown in fig. 6. When the strings are ready, divide the amount of cyanide to be used into parts corresponding to the number of jars. Do each part up in a couple of thicknesses of ordinary newspaper and put in ordinary brown paper bags, and attach the bags to the strings, as shown in tig. 6. While the jars are empty test the arrangement to see if it works satisfactorily. After each bag. Fiij. C—Violet Iiouse i)repare(I for fumigation (from Woods ik I)or,sett). is siispended in place, the other end of the string securely fastened where it can be reached from the outside, and the arrangement tested, move the suspended bags to one side, so they will be out of the way while j^utting the water and acid in the jars. When this is done, pour into each jar an amount of water about equal to the bulk of the potassium cyanide in the bag. Eight ounces of cyanide will require about half a pint of water. The sulphuric acid should then be poured in until steam rises from the water. This would require for a pint of water about a pint and a half of acid. It is not necessary, however, to measure the acid, as the evolution of steam
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