This is a volatile and inflammable clear liquid, which gives off an insect-killing vapour at a low temperature. The vapour being heavier than air, it is advisable to apply the liquid at top of holes when it is desired to eradicate ground pests. For vaporizing houses about 1/2 pt. of liquid is sufficient for 500 cub. ft. of space, and for ground pests about 2 oz. poured into holes about 2 ft. apart is considered sufficient. It appears to be a much more costly and less efficacious method of ridding the soil of pests than turning up the soil with the spade or fork and exposing the pests to the birds.