Are generally of a roundish shape, and more elastic than the generality of fleshy swellings. However, the latter circumstance depends very much upon the nature of their contents and the thickness of their cysts. These tumours form more frequently on the head than any other part, but they are frequently met with in all situations under the integuments and sometimes in deeper places. They are in general nearly globular, feel very firm, the skin covering them is not inflamed; but in the centre of the tumour on the skin (if white) it often happens that in its early stage a black or dark coloured spot may be seen. In general they are unattended with pain, are never in themselves dangerous, and only require removal from the parts in which they occur, on account of the unseemly appearance they produce. There are other tumours situated in different regions of the body, the most important of which are those affecting the udder, and which we will describe when we consider mammitis and its sequels. Meantime, I would direct your attention to another important subject, known as