PART I. 



Monthly Order of Cholera Prevalence. 



211 



alone first, reserving those regarding the more limited communities to be noticed 

 afterwards. 



That their results in general agree very closely is evident even on a casual inspection. 

 The first table gives a total of 104,295 for the "I'o years' mortality, or an average of 

 8691 "2 per month when the entire period is sub-divided into 12 monthly periods. 



The month in which the actual numbers most nearly approach this average is 

 November, the 26 years' deaths of which are 8,323. 



The second table for 12 years gives a total mortality of 31,538, or a monthly average 

 of 2628" 1. Here again November, with a total mortality of 2,789, is the nearest to 

 the average. We are thus justified in regarding November as a month of average 

 cholera-prevalence — as a month presenting the conditions producing the disease in a 

 state of medium intensity — and consequently in employing it as a starting-point for 

 comparison, and the conditions then existent as bases for the study of those present 

 at other times. 



The order, proceeding from minimum to maximum, which the individual months 

 hold in regard to prevalence in the two tables, is shown in the following table, which 

 also includes a third column, showing the order in prevalence since the beginning of 

 1871 :— 



TABLE X. 



Months arra7iged in order of Cholera-prevalence from minimum to TnaxiTnuin. 



Comparing the first two columns, we find the differences to be as follows: July 

 and August occupy reversed positions, August coming first and July third in the first 

 column, while July comes first and August third in the second one. In both columns 

 October occupies the fourth place, but June, which in the first column precedes, in 

 the second follows, January and December. In both columns the rest of the order is 

 identical, save that in one April, in the other March, comes last. 



