THE RAT THEORY OF PLAGUE EPIDEMICS 



15 



length of time ; and its fall occupies practically 14 days. Subsequently 

 it disappears, whereas the epizootic maintains a low but certain level. 

 One would expect the fall in rat plague to occur somewhat previous to 



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T U 21 28 4 11 IS 25 4 11 18 25 1 8 15 i'A 29 ti 13 20 27 :j 10 17 2-1 



22 29 5 12 19 20 2 9 Ili2;i30 7 1) 



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Chart IV. 



that of epidemic. The condition of affairs is, however, a repetition of 

 what took place during 1902. 



(229) 



