I cannot close this subject without giving the opinion of a very able anatomist regarding it, Harrison, of Dublin. In the first place he speaks of an irregular artery, which he has seen running along the front of the trachea to the thyroid gland and cellular membranes beneath it. He had seen this so frequently in this situation, that he describes it under the name of the middle thyroid artery. “This is” he says “so common an occurrence that it should be remembered by the practitioner of tracheotomy.” He further goes on to say, “in children the space for tracheotomy is very limited,” and directly that “particular attention be paid to the inconsiderable portion of the trachea that can be exposed between the thyroid gland above, the arteria innominata, the left carotid artery, the remainder of the thymus gland below. The deep thyroid veins also descending to the vena innominata obscure the trachea very much, these together with the great mobility of this tube, add to the danger and difficulty of this operation.” Pancoast says: “The checking of hemorrhage from the veins and arteries divided in tracheotomy requires particular attention; from six to eight ligatures are usually employed. They should be applied in general as the vessels are cut and before the opening of the trachea as there must be blood drawn by respiration into the trachea and thereby endanger life.” These dangers constitute shoals and quicksands to the anatomist and surgeon, that has made many a one shudder at their approach. The six or eight vessels to tie, before daring to open the trachea, causes delay dangerous to life, as well as to the success of the operation, and brings into question the propriety of the operation, and sometimes the skill of the physician. In the upper operation, laryngo-tracheotomy, you can enlarge the opening upward whenever necessary, with but little risk, by cutting through the thyroid cartilage. In fact, it may be opened above or below, one or both, with but little risk; whereas in the lower operation it is almost impossible to do so. When it becomes necessary, the safest plan is to enlarge the opening upward, as much as is practicable, and downward as little as we are able to get along with. The space taken up by the lower operation on children is very limited, and the operator must necessarily be cramped for want of room. The cervical portion of the adult trachea is laid down at from two to two and one half inches long. It is composed 18 or 20 fibro cartilages, this makes the space between each ring 1–8th of an inch. According to that measurement, allowing the 20 rings for 2½ inches makes the space taken up by cutting three rings 3–8ths of an inch long in the adult, if no more is divided, and proportionately less in the child. We can readily understand that those operating in this region do as little cutting as possible, and although the operation so far as the outside incision, may