Pus may form superficially, when it is called subcutaneous suppuration, in which case there is a minimum of pain, because tension is not great and the distance to the surface is short. Collections which form beneath the fasciæ, especially the deeper fasciæ of the limbs and trunk, give rise to much more extensive disturbance, both locally and generally, and frequently do not point for many days; or, instead of pointing, burrow deeply and find their outlet at some undesirable point. These are known as _subfascial_ collections. _Subperiosteal_ abscesses give rise to still more pain, because of the unyielding character of their limiting structures, and the symptoms caused by them are acute and distressing. An illustration of the pain which may follow deep suppuration may also be seen in the ordinary panaritium, or bone felon, where the path of infection is from without, but the destructive lesion is confined within absolutely unyielding tissues, at least at first. Along certain tissues infection spreads with rapidity. This is particularly true of the delicate areolar tissue seen between tendons and tendon sheaths, and the infectious process may follow this tissue wherever it shall lead, even along complex courses. The question often arises, _Can pus be resorbed?_ There is no question but that small amounts of pus are disposed of by phagocytic activity, and the disappearance of purulent infiltration, under the influence of favoring remedies, or even when let alone, is not infrequently noted. True pus resorption is a question of phagocytic possibilities, and can occur only in very limited degree, as a result upon which it is not safe to count, and which is capable of encouragement only up to a certain point.