It has been described fairIy often that in one race or in one country leprosy tends to take a different clinicaI course compared with others. I have been studying this question in West Africa, Suda!1l, Egypt, Ceylon, India and recently, Malaya. The follow ing facts seem to be established from these observations which will be extended further in the near future. (ii) In CeyIon leprosy tends to take a very miId course and the prognosis in the many mono-macular cases appears to be good. The incidence is not very high. It may be noted here that in all countrie § some individuaIs seem to be unresistant against leprous infection from the start.(iii) In Calcutta the incidence of leprosy is probably high, though not as high as I found in Nigeria. A good many of these cases are frank tubercuIoids ' and give a very good prognosis with regard to. treatment.(iv) In Malaya as Ryrie will point out later, Indians shew these mild forms of leprosy in striking contrast to the very seriou5
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