Born in 1792, about 1809 and 1810 was a Surgeon's Assistant in the Royal Cumberland Militia, and in a General Military Hospital. In 1819 he went to Scarborough and from 1821 was in partnership with William Fraser for thirty years. Both died within a few weeks of one another - Dunn on February 4th, 1857. He was an honorary member of the Yorkshire Philosophical Society, and was the author of several publications, including remarkable cases. Publications: *Suggestions on the Relief of the Sick Poor*, 1817. *Vital Statistics of Scarborough*, 1840. "Case of the Presentation of a Bag of Water after Delivery unconnected with Plurality of Children." - *Med.-Chir. Trans.*, 1819, x, 896. The child was delivered normally; half an hour later a bag presented at the os externum, from which, on being ruptured, a pint of fluid escaped; the placenta was then detached and removed, but no anatomical description is given. "On Compound Fractures." - *Ibid.*, 1823, xii, 167. He followed Hippocrates in cutting off the projecting ends of the bones before reducing compound fractures. "Case of Ruptured Uterus during Parturition followed by Internal Abscess and Eventual Recovery, so as to bring forth another Full-grown Child Fifteen Months afterwards." - *Edin. Med. and Surg. Jour.*, 1833, xl, 72. The uterus ruptured during labour; after delivery of the child, the hand was passed through the rent into the peritoneal cavity, so that the kidney was felt. Recovery followed after suppuration, and fifteen months later the woman was safely delivered of a full-term living child, both doing well. "Account of a Case in which a Child was expelled from the Womb after the Interment of the Mother." - *Ibid.*, 1838, 1, 533. A woman, age 39, in labour was found to be the subject of cancer of the cervix. After discharge of the liquor amnii, the cervix remained rigid, and only by pushing one finger through the diseased mass could the scalp of the child be felt. Further dilatation was impossible unless by using unwarrantable force. The woman died on the third day of labour. The nurse noted the foetus in the woman's abdomen seven hours after death. The woman was buried the next day, but in consequence of reports that she had not been properly treated, was disinterred twenty-four hours later. A foetus of eight months was then found between the thighs, one foot still in the vagina, the placenta attached to the fundus uteri which was not contracted; the head of the uterus was occupied by extensive cancer. The expulsion was attributed to gas formation in the intestine, and the jury gave a favourable verdict. In a note, references to a considerable number of similar cases are given. "Case of Dislocation of the Left Femur on the Pubes." - *Lond. Med. Gaz.*, 1839, xxiv, 275. A man, age 43, suffered dislocation from a fall of earth. The case was of such rarity that none of the practitioners called into consultation had seen a case either in hospital or private practice. But following the course laid down by Sir Astley Cooper, the man was depleted by bleeding to 25 oz., and by 6 gr of tartar emetic in divided doses; reduction was successfully made seven to eight hours after the accident. Seven weeks later the man was seen walking very well and able to rotate the injured limb as readily as the other.