From what has been said, it will appear, that cancer is to be prevented by using the most vigorous means for the removal of simple schirri, upon their first appearance. Of these, local bleeding is the most powerful, and ought to be freely employed. Next to this, an issue in the neighbourhood of the part ought to be most depended on; and these two remedies must be employed early, and continued carefully. Whenever a simple schirrus arises, we ought to be on our guard, in whatever situation it may be placed; but, if it occupy a secretory gland, we require to be doubly vigilant. This, at first, is not painful, at least the patient only complains of slight uneasiness shooting for a moment through it. This circumstance too frequently prevents the patient from attending to it; for where there is no inconvenience sustained, there is little inducement to apply for assistance; and, not unfrequently, an ill-judged modesty contributes to this delay. But, although the patient may be little concerned at this period, yet the surgeon must not observe the same indolence. Aware of the dangerous consequences of allowing the tumor to follow its natural course, he will apply leeches once and again, and insert an issue as near the part as possible. The remedies called discutient have been much recommended at this stage; such as sal ammoniac dissolved in vinegar; and this is sometimes useful, but perhaps not more so than the vegetable acid by itself: When it does not interfere with bleeding, it may be usefully employed. By means of these remedies, we may frequently remove recent tumors, which depend merely upon the enlargement of an organ, without any other considerable change of structure. But it is more difficult to remove tumors which are not produced by the mere enlargement of a part, but depend upon a change of structure, or the formation of new parts; as, for instance, warts, polypi, &c. The small indolent tumors, however, which take place in the cellular substance, may sometimes be removed by the early use of these remedies.