It may be well, however, to take another case or two for further illustration. Here, then, is a decayed tooth extracted, but the part from which it is taken does not heal, as is usual. The hole in the gum does not close, and a discharge of offensive humour flows from it constantly. The bone of the upper jaw is evidently wasting, and the decay has extended somehow considerably up the side of the nose. The hole, however, is so small, that the usual glass syringe cannot enter it. We got an exceedingly small instrument, used for the injection of morphia under the skin. The point of this syringe is a needle with a point that is hollow nearly to the very end. When this point was broken off, the hollow part was so small that it entered the hole in the gum, and so it was easy to inject the weak acid up to the bottom of the sore, which had come to be only a little under the eye. About an inch and a half of hollow had to be washed out with the acid. But in a very short time all discharge ceased, and the cure was perfect. Both of these cases are comparatively simple, but they show clearly the great value of this use of acetic acid. Carbolic acid is much more commonly used for such a purpose. It has the drawback of being liable itself to melt away the healthy tissue, and to make a wound larger. Acetic acid never does this, and so heals more quickly and certainly. We might take a much more difficult case. It was that of an abscess and bad sore in the lower bowels. It was supposed to be necessary to perform a very dangerous operation in order to try to cure this--not much hope was held out of its being possible really to cure. It was, however, quite possible to reach the sore by the injection of acetic acid. The sufferer was directed to have this done regularly. In a very short time there was a complete cure. In such a case all that is wanted is an ordinary india-rubber enema. A much larger quantity of water is required, but about the same strength of acid. First of all, as much acidulated water as can be taken up with comfort is injected: after a minute or so this is passed off. Then another is used in the same way, and passed off also. A third syringing may be employed, when about half-a-teacupful is taken and retained. If the acid gives no comfortable feeling of warmth it needs to be strengthened till it does so, but not so that it produces any pain. The operation really well done is not in the least painful, but, on the contrary, rather comfortable.