Arriving in England in March of 1894 on study leave from his posting with the Indian Medical Service (IMS), the young surgeon Ronald Ross (1857-1932) had high hopes for his visit to the imperial metropolis of London. Like many other young medical men interested in the diseases of warm climates, Ross sought out the great Patrick Manson (1844-1922)-then already legendary in the city as a private practitioner and researcher of tropical diseases. On 9 April 1894, he arrived before the imposing façade of Manson's fi ve-story Georgian townhouse, hoping to meet the master. Ross 1 later recalled: He was out but gave me an appointment for the next day … He was very kind to me and showed me the malariaparasite specimens in his house, 21 Queen Anne Street, Cavendish Square. (p. 7