Egypt, telling him when there to gather information as to the suitability of the country for invalids, and directing him how to employ his leisure in furthering this object. He was to study German on the voyage thither, and to take with him as models Clarke's book on Climate and Mitchell's on Algiers, and any French or German books on the subject he might hear of. He would require to collect (1) The average daily temperature; (2) The hygrometric and barometric states daily; (3) The temperature of the Nile; (4) The temperature of any mineral springs; (5) The general character of the geology; (6) The general character of the botany of the country. He asked him to inquire specially as to the effect of the climate on consumption, and pointed out that Pliny described Egypt seventeen centuries ago as the best climate for phthisical patients. For amusement he was to take some good general book on Egypt and Egyptian hieroglyphics. The serious study of a succession of inquirers was to be the young man's holiday amusement! Simpson's most notable contributions to archaeology were made when his time was most occupied professionally. The researches on Leprosy were first enlarged and improved. In 1852, when in the British Museum, his eye was attracted by a small leaden vase bearing a Greek inscription signifying the _Lycium of the Muses_. By a painstaking inquiry he established that this lycium was the _Lykion indikon_ of Dioscorides, drug used by ancient Greeks as an application to the eyes in various kinds of ophthalmia. It was obtained from India, and is still used for these purposes in that country. He discovered that there were three other examples of this ancient receptable for the valued eye-medicine in modern museums.