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Cholera in Relation to Certain Physical Phenomena. [part i. 



The relation of cholera to the rainfall (a still greater quantity of which falls 

 between June and September) is pretty nearly the same as at Cawnpore, and the month 

 of maximum relative humidity also coincides with the maximum cholera month. 

 The remarks made regarding the relation to temperature in the two last stations apply 

 equally here. 



(7) Meerut. 



The only other station which we propose to select in the North-Western Provinces 

 is that of Meerut, a large military and civil station situated between the Jumna and 

 the Granges, some 30 miles from either. The cholera statistics of this station comprise 

 a long series of years and furnish an aggregate of 2,596 cases registered among troops 

 and prisoners, a large proportion of the former being Europeans. 



TABLE LXir. 



The average Monthly Water-level, Rainfall, Relative Humidity, Temperature, Atmo- 

 spheric Pressure, and total Cholera among the European and Native troops 

 and prisoners at Meerut. 



The water-level registers for Meerut are very complete, and have been conducted 

 by Dr. W. Moir since 1871. The fluctuation coincides very closely with the rainfall. 

 In June the water is at its lowest ; it rises a little after the heavy rain of July and 

 August, but scarcely varies two feet during the whole year. It is at its highest level 

 towards the end of October. The data of relative humidity are not very satisfactory, 

 but such as they are, they show that, as very generally elsewhere in the non-endemic 

 area, the greatest humidity coincides with the maximum cholera, but the least humidity 

 not with the minimum cholera. 



The temperature is highest in June, a month later than at the majority of the 

 stations of this area hitherto referred to. 



The cholera-history of this station shows that the rainy season — even three months 

 of it, July to September — has furnished more than half of the total cholera; 1,055 

 out of the 2,596 having occurred in August alone. It obtains a larger proportion of 

 its total rainfall during the earlier months of the year (January to May) than the 

 stations lower down in the non-endemic area of the Grangetic plain. In other respects 



