On the 21st of June the water of the Mustaphi Dighi very nearly dried up and the breeding of mosquitoes ceased in that tank for a time but large number of Anopheles larvae were found in the foot marks of cattle and in the cracks and crevices of mud around the tank bed where water collected after a shower. [...] IV The problem of the Dighis In days gone by the Purana Dighi the Khan Dighi and the Mustaphi Dighi acted as central reservoirs of water of the town of Birnagar and were replenished with the flood water of the Churni by channels of comunications which have long ceased to function. [...] As suggested elswhere the solution lies in partly re-excavating the tank and also in digging up the old channel of communication mentioned above which will enable flood water to enter the tank during the rainy season and when the flood recedes the entire sheet of water in the unexcavated portion of the tank bed which is probably on higher level than the bed of the Baromeshey canal or the adjoin [...] In 1926 the hibernation period termiated temporarily with the advent of the spring rains in the beginning of March but with the approach of the hot season and drought at the end of May the mosquitoes again went into hiding. [...] A careful examination of the frequency figures shows the curious feature that the fever incidence in each month rises about the middle of the month and drops down towards the beginning and the end.
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