Leeches (To Make Them Bite). Leeches may usually be induced to take more readily than otherwise by rubbing the surface to which they are applied with a little milk. Previous to their application the skin should be carefully cleansed, not with soap, but with plain warm water. A wine-glass is the best thing to keep them over the spot where they are to be applied. When they have performed their office, they may be made to disgorge the blood by putting a few grains of salt upon them. 'Ihey are often killed by the application of too much salt. Probably, were they put into salt and water for a little time it would be better.