Collected papers . pment of plague. It is true that the number of casesof plague during the months October to December are comparatively 57—3 894 Influence of Saturation Deficiency and Temperature few, but as the climatic conditions at this time of the year are by nomeans antagonistic to the maintenance of epidemic plague, an explana-tion of the reduction in the case incidence and mortality from thisdisease during these months must be due to other causes. An examination of charts deriyed from particulars giyen by VanLoghem and Swellengrebel (6) with regard to plague in Java, DutchEast Indies,
Collected papers . pment of plague. It is true that the number of casesof plague during the months October to December are comparatively 57—3 894 Influence of Saturation Deficiency and Temperature few, but as the climatic conditions at this time of the year are by nomeans antagonistic to the maintenance of epidemic plague, an explana-tion of the reduction in the case incidence and mortality from thisdisease during these months must be due to other causes. An examination of charts deriyed from particulars giyen by VanLoghem and Swellengrebel (6) with regard to plague in Java, DutchEast Indies, is interesting and instructiye. The first chart (seeChart XV) shows the incidence of plague in the Melang Department•of Java, from its introduction in April 1911 to October 1912. Althoughthe time of the east monsoon is spoken of as the dry period and thetime of the west monsoon as the wet period/ there is extraordinarily Westmonsoon. East period. West Wet period. East ^- • • . ^ o ^ • Chart XV. Java: Melang Department. First two years of plague, 1911 and 1912. Temperature. Saturation deficiency. Plague deaths. little variation in the temperature and saturation deficiency throughoutthe year—the temperature keeping withm the limits 74—77-5° F. andthe saturation deficiency within the Kmits -IS--27 of an inch. Theclimate is not at any time unfavourable to the spread of plague, andit is not surprising to find that there is no marked epidemic seasonand that plague occurs with apparent indifierence at all times of theyear. The sudden rise and fall of the disease after its introductioncannot be explained on the grounds of adverse conditions of temperatureor saturation deficiency and may be due to some hitherto unrecognisedcause. Plague continued in epidemic form in the Melang Department Re^mrts on Plague Investigations In India 895 throughout the year 1913 (see Chart XVI), the number of cases in-creasing from the month of August
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