_Lithotrity._ I have memoranda of 155 operations of lithotrity in which I have administered chloroform. The number of cases of stone in which these operations took place was sixty, but some of the patients had operations performed, either without chloroform, or when it was administered by some one else. The earliest cases of lithotrity in which I administered chloroform were in St. George’s Hospital, and a great number of the patients to whom I have given it were the private patients of Mr. Fergusson, who is entirely satisfied of its utility in this operation. Speaking of this operation in his _Practical Surgery_ (third ed., p. 800), he says: “I am of opinion that there is not any department of practical surgery in which anæsthesia has been of more service than in this.” I have administered chloroform in a few operations of lithotrity by Sir Benjamin Brodie; but I believe that he does not approve of it in this operation, as a general rule. The following are amongst the other surgeons whom I have frequently assisted by giving chloroform in this operation: Mr. Cæsar Hawkins, Mr. Cutler, Mr. Coulson, Mr. Charles Hawkins, and Mr. Henry Lee. Mr. Fergusson, in one of his operations, extracted some portions of gutta percha bougie round which a phosphatic calculus had formed. He was not informed of the presence of the bougie in the bladder, until it was extracted. On another occasion, a patient was brought from the country soon after a bougie of this description had broken off, and he extracted with the lithotrite the piece remaining in the bladder. It was between two and three inches in length. It is generally desirable to make the patient quite insensible during the operation of lithotrity; and the patient sometimes groans during its performance, when he is in a condition that, so far as one can judge, he would show no sign of sensation under the use of the knife; but he, of course, has no recollection of the operation afterwards. The bladder is sometimes apt to expel the water which is injected, if the patient is not well under the influence of the chloroform; but when the vapour has been continued for a few minutes, and the narcotism is complete, the bladder will, I believe, always hold water as well as if the operation were performed in the waking state, and generally much better. There are some surgeons who occasionally raise the breech of the patient for a short time during this operation, so that the head becomes considerably lower than the body. Stout old men generally snore more loudly when in this position under the influence of chloroform; but I have not met with any ill effects, nor expected any, from the head being lowered for a short time. From ten to twenty minutes has been the most usual duration of the operations under chloroform at which I have been present.