264 



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



Now, on comparing this table with the one [Table XLIII, page 246] regarding 

 the monthly prevalence of cholera in the endemic area, attention is at once 

 arrested ;by the circumstance that the months of maximum prevalence in the two 

 groups of stations do not coincide — July, August and September being the months 

 of maximum in the group of stations which forms the subject of the present chapter, 

 whereas, so far as the cholera-history of Calcutta itself goes, they are the most 

 favourable, and even when the endemic-area stations are taken as a group furnish a 

 minor proportion of the total. 



Twenty-five stations have been selected in the different districts of Upper and 

 Central India, and, with a single exception, July or August has furnished the largest 

 number of the registered cases of cholera in every one of them. The exception is 

 Peshawur, which has its maximum of cholera in September. This station will be 

 referred to further on. 



It will be recollected that the dozen stations which we selected for illustrat- 

 ing the seasonal prevalence of the disease in the endemic area furnished 15,699 

 registered cases of cholera from among the official communities, regarding whom 

 alone, as already explained, it is possible at present to obtain satisfactory statistics. 

 The cholera returns collected from among 25 similar groups of the population in 

 stations situated beyond the bounds of the endemic area amount to 25,338. The 

 aggregate monthly cholera statistics of the selected group of stations in the 

 endemic area were given at page 248 (Table XLIV), and a similar summary regard- 

 ing the other group is annexed : 



TABLE LI. 



The aggregate, monthly 'prevalence of Cholera among Soldiers, Sepoys and Prisoners 

 at 25 Stations in Upper and Central hidia during periods of from, 18 to 

 51 years. • 



A comparison of the above summarised statement with the like summary regarding 

 the endemic group of stations, omitting Calcutta, presents some points of resemblance 

 as well as of contrast. In both tables January is seen to occupy the lowest place 

 as to cholera-prevalence, and in both also there is shown that a gradual increase 

 of the disease takes place with the progress of the year. In Lower Bengal, how- 

 ever, the maximum culminates in April and decHnes month by month till September, 

 when a slight rise occurs until November, and it then subsides till minimum is 

 reached ; but in the non-endemic provinces, instead of a remission of the disease 



