250 



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



The first column under each seasonal period gives the total number of cholera 

 cases which have been registered in each of the places cited during the months 

 named, and the following column the jprajportion which this number bears to the 

 total number of cases of which records exist as having occurred during the 23 to 

 51 years that statistics have been collected. The aggregate iigures are given in the 

 last column of the table. 



The average rainfalls of the seasonal periods have been calculated on the same 

 principle, the proportion to the average of the total annual amount for several years 

 being likewise given in a separate column, and the figures printed in different type 

 for convenience of reference. 



If the same mode of calculation be applied to ascertain the prevalence of cholera 

 according to season to the aggregate number registered in all the stations, the 

 cholera of the official and non-official communities of Calcutta being included, we 

 get figures closely approximating to those furnished by Calcutta itself, as the 

 following statement indicates (Table XLVI). 



As, however, the Calcutta figures, which include the cholera mortality of the 

 general population, represent nearly ten times the totals of all the other stations, 

 it will be evident that the proportion arrived at might convey a very erroneous 

 impression as to the seasonal prevalence of cholera at the other stations of the 

 table. That such is the case will be seen at a glance from the accompanying 

 statement. 



TABLE XLVI. 



The ^prevalence of Cholera according to Seasons in twelve selected Stations 



in Lower Bengal. 



We now find that, whereas the five first months of the year (January to May) 

 furnish 60 per cent, of the total Calcutta cholera and 54 per cent, of the cholera 

 of the endemic area generally, the four months' rainy season (June to September) 

 furnishes 10 per cent, more of the cholera of the selected stations, taken as a group, 



