To mention all his suggestions and all his contributions to the arts which he specially practised would here be obviously impossible as well as out of place; but to medical readers the mention of one instrument associated with his name, and known as _the sound_, will give a small indication of how much we are in his debt. The principle of this instrument had been known long before he took it in hand, but it was left for him to introduce it into practice, perfect it, and preach its value in diagnosis and treatment. So thorough was his work, so farseeing his science, that our knowledge of its utility has scarcely been added to since he first drew attention to it in 1843. Towards operative work his attitude was characteristically conscientious. We are told that he habitually put the following question to himself when contemplating a serious operation: "Am I conscientiously entitled to inflict deliberately upon my fellow-creature with my own hands the imminent and immediate chance of death for the problematic and prospective chance of his future improved health and prolonged life?" The fact that he habitually thus questioned himself is an evidence of the state of surgery at that time. Operations were undertaken only as a last resource to save life; the surgeon knew full well that he placed his patient in further peril merely by cutting through the skin, in a manner which has now happily become a thing of the past. His work was so pre-eminently practical that he never stopped to collect together his experiences into a scientific treatise. Although he revivified midwifery, and was one of the original founders of gynaecology, he left to aftercomers the labour of studying what he had done, and drawing the conclusions on which to strengthen the fabric of the science. His pamphlets, papers, and reports are very numerous. It would be wrong to say that modern thought has approved all that he wrote; but however much time and increased knowledge may have modified his teaching, they have not detracted from the value of his researches, discoveries, and suggestions, or from the stimulating influence of his work upon contemporary practice and thought.