Collected papers . eightin August-September 1899. From Port Louis other parts of the island in turn became infected,and subsidiary epidemics took place, which ran their own course,uninfiuenced apparently by chmatic conditions. The Httle epidemicat Pamplemousses, for example, reached its height in October andthe outbreak at Plaines Wilhems was still iiicreasing at the end of theyear. These circumstances suggest that in places where the combined Reports 07i Plague Investigatioiis in India 897 effects of temperature and saturation deficiency are at no time un-favourable to the occurrence and spre
Collected papers . eightin August-September 1899. From Port Louis other parts of the island in turn became infected,and subsidiary epidemics took place, which ran their own course,uninfiuenced apparently by chmatic conditions. The Httle epidemicat Pamplemousses, for example, reached its height in October andthe outbreak at Plaines Wilhems was still iiicreasing at the end of theyear. These circumstances suggest that in places where the combined Reports 07i Plague Investigatioiis in India 897 effects of temperature and saturation deficiency are at no time un-favourable to the occurrence and spread of plague, other factors comeinto play in determining the local epidemic. It would thus appear that while the combined effects of temperatureand saturation deficiency have in the majority of cases an influenceon the incidence and course of plague epidemics, yet, .under certainconditions, such epidemics come to an end at a time when the chmaticconditions are presumably favourable for a continuance of the Chart XVIII. Mauritius. The first epidemic, 1899. Temperature. Saturation deficiency. Plague cases. 1, Whole Island; 2, Plaines Wilhems; 3, Port Louis; 4, Pamplemousses. In these cases other factors must come into play, and attention isdirected to the work of the Commission in connection with the seasonalbreeding of rats, the decrease in the numbers of rats during epidemicperiods and the accompanying increase in the proportion of immune tosusceptible rats. The adverse influence of high temperature andsaturation deficiency may be explained by their effect on the durationof life of the rat flea, Xenopsylla cheopis, when separated from its the mean temperature rises above 80° F. and when suchrise is accompanied by an increase of the saturation deficiency to above 898 Influence of Saturation Deficiency and Temperature •30 of an inch, plague cannot maintain itself in epidemic form, thougha high temperature fer se may not bring about the termination of aplagu
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