We have seen a limb which threatened the very life of the patient treated as above. The general symptoms abated almost immediately; growth, as well as healing, set in, and the limb was quite restored to its normal condition. But patient persistence in treatment is needed for a bad case. If under bathing or fomentation the abscess seems to swell, such is only the natural progress of cure, and should not be regarded as increase of the trouble. Where the swelling shews undoubted signs of diseased matter below the surface, it may be opened as above directed. We know of limbs that have been long distorted, and under rubbing and fomenting they are becoming gradually all they ought to be. No one need fear that by such treatment they will grow worse. _See_ Armpit Swelling; Bone, Diseased; Knee; Limbs, Inflamed, etc. Acetic Acid.--For use in our treatment we recommend Coutts' Acetic Acid. It is of uniform strength and purity, and can be had from most druggists. Weak acid may be understood as one part of this to twelve parts of water. In many cases, however, much greater weakness than this is necessary, owing to the tenderness of the parts treated. As a general rule, the dilute acid should only cause a _gentle_ nipping sensation and heat in the sore. If it is painful, no good is done. Frequent gentle applications are always much better than a few severe ones. Tasting the acid is a good test. If it can be swallowed without inconvenience, it may then be tried on a tender part, and if necessary even further reduced in strength. Where more convenient to get it, white wine vinegar may be used instead of this weak acid; it will do equally well.