The two works on which Sir Henry Thompson’s reputation among the medical profession chiefly rests are his “Clinical Lectures on Diseases of the Urinary Organs,” and his “Practical Lithotomy and Lithotrity,” both of which have gone through numerous editions; but he has also written many smaller treatises on allied subjects, and his articles in Holmes’s “System of Surgery” almost reach the dimensions of separate works. His practice has grown to large dimensions in this department, and in 1877 he was able to publish a list with particulars of 500 cases in which he had performed operations for stone in the bladder, being he believed the largest ever published by an operator. The unrivalled extent, also, to which he was enabled to utilise the experience of other surgeons, by their communication of their cases to him, made his book on lithotomy and lithotrity of unique value. Sir Henry Thompson is known to have made very large use of the operation devised by Civiale of Paris, in 1817, for crushing stones into powder or gravel, rendering it unnecessary to perform the serious operation of lithotomy. Civiale’s first operations of this kind were performed in 1824, and to him the introduction and successful application of the method is due. The operation has been largely improved of late years, and much of this is due to Sir Henry Thompson. Owing to his well-known skill in this department of practice, he was called in to the late King of the Belgians in 1863, and succeeded in affording him relief by operation, when the most distinguished Continental surgeons had failed. The honour of knighthood was subsequently conferred upon Mr. Thompson by Queen Victoria in recognition of his great services to her uncle. About this time Sir Henry became full surgeon to University College Hospital. He has since relinquished active work at the hospital, becoming Consulting Surgeon and Emeritus Professor.