252 



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



statistical returns of the military stations within short distances of it, and which are, 

 so far as is at present known, identical with it in their physical features. These 

 are Dum-Dum and Barrackpore, situate on the left bank of the Hooghly, and at 

 distances from Calcutta of four and fourteen miles respectively ; and one station on 

 the opposite side of the river, about 25 miles from Calcutta — Chinsurah, near Hooghly, 

 where, until recently, a large military depot was kept up. 



Kegarding these stations very accurate data are available extending over a period 

 of more than fifty years. In order to ascertain whether any striking agreement exist 

 between the seasonal prevalence of cholera among the civil (as recorded at Calcutta) 

 and purely military population, we have excluded all returns which are in existence 

 in connection with these stations except the strictly military. The following table 

 will show the number of cases which have been furnished by the European and 

 Native troops of these stations — those of Fort William and Alipore being joined 

 and given as the military cholera statistics of Calcutta. 



TABLE XLVII. 



A Monthly Statement of the Cholera cases that have occurred among the strictly 

 Military 'population of Calcutta and adjacent Military Stations ; also of 

 average Water-level and Rainfall at Chinsurah. 



It will be observed that the data regarding rainfall and water-level are not those 

 of Calcutta, but of the station farthest removed from it, viz.^ Chinsurah. This has 

 been done with the intention of making the comparison as complete as possible, 

 and likewise because Chinsurah (or rather Hughli) is one of the meteorological 



* The cases of cholera which occurred in August 1879, after a cyclone (113 in Dum-Dum and 50 at Barrackpore), 

 have been retained in the table, but these were manifestly exceptional cases, and in order to illustrate the ordinai-y 

 seasonal prevalence of cholera they should be deducted from the total cholera of the four stations. The total would 

 then be [478 ^ 163 =] 315 : this proportion for August has been adopted in the Diagram, 



