It is not advisable to fill lugs higher than three-fourths of their depth. This is suggested to reduce the weight. A full lug will weigh in the neighborhood of fifty pounds. Lowering the contents will reduce this weight to as low as thirty pounds. In transferring breeding stock from one lug to another, the top sack of the first lug may be used as the bottom carpet for the new lug.
Bottom sacks remain serviceable for about three weeks.
A potential commercial field which was not discussed in the body of this work is that of the extraction of oil from earthworms for medicinal use. I have repeatedly experimented with earthworm oil and have found it has exceptionally fine penetrating proclivities. That earthworm oil has medicinal value is, however, an accepted fact, but to date myself and associates have not found a satisfactory method to employ to extract the oil in sufficient quantities to raise it to meet even a small commercial demand. The method used was slow, tedious and annoying, though I have managed, by painstaking efforts, to garner well over a gallon over months of experimenting. At the present writing experiments are being prepared which will employ electric heat.