PART I.] 



Cholera amongst Native Troops in Calcutta. 



21 



TABLE XVI. 



Cholera Admissions among Native Troops in Calcutta [Fort William, and Alipore'], 



1852 to 1876. 



The period included is of such short duration that it is remarkable to find 

 how far these tables corroborate the results of the previous ones. 



Our last sources of data regarding seasonal prevalence lie in the great jail at 

 Alipore. Only 39 cases are recorded as having occurred at the Presidency jail (1872 

 to 1876). The following table shows the figures regarding cholera admissions in the 

 Alipore Jail from 1854 to 1876. Like the previous tables, its materials are derived 

 from Dr. Bry den's statistics of cholera : — 



TABLE XVII. 



Cholera Admissions in Alipore Jail, 1854 to 1876. 



* Forty-one of these admissions occurred in 1866. 



t Nineteen of these admissions occurred in 1858 and thirty-four in 1859. 



The results in this last table differ from those in the former ones in showing a 

 comparatively high prevalence in June and July. This discrepancy is, however, greatly 

 reduced in importance, when we find that 41 of the total admissions in June 

 occurred in one year, and 53 of those in July in two successive years. 



The evidence afforded by this series of minor tables regarding limited communities 

 is confirmatory of the general correctness of the indications afforded by the statistics 

 of the first two, and it is of importance to observe how much data derived from 

 limited communities may furnish trustworthy indices regarding the seasonal prevalence 

 of disease. The great requirement is, that they should embrace a sufficiently pro- 

 longed period to do away with the fallacies introduced by exceptional outbreaks; 

 where this condition is fulfilled, such data may be resorted to with tolerable confidence. 

 It is evident that such figures, when thus employed, are in great measure free from 

 the sources of fallacy inherent in them when employed as an index of the general 

 prevalence of cholera among the population at large in one year as compared with 

 another. 



