PROLONGED cooking in a strong solution of soap is a much more satisfactory method of cleaning these interesting objects than the commonly recommended method with caustic potash. The plan which I have tried with success is to place the materials in the soap solution in a small phial, which is enclosed in a sand-bath, and then left on a hot part of the kitchen range. In a few hours all the surrounding, tissues, or even the whole of the rest of the animal, is as completely disintegrated as it would be with the liquor potassae method, and the teeth all stand out bright and clear, but there is not the same risk of the so-called “palate” becoming disintegrated or curling up and becoming brittle.