
AMERICAN MUSEUM GUIDE LEAFLETS 

passed east to Melbourne, Brisbane, and other Australian cities, 
north to Portugal and Scotland, and around the world to Brazil, 
Porto Rico, California, and New Orleans. We are actually to-day 
in the midst of a potential world pandemic of plague like that of the 
Middle Ages; but our knowledge of the relation of the rat to this 
disease has made it easy to prevent general spread in any of the 
countries into which infection has been introduced outside of Asia. 

Fig. 32. THE THIRD PANDEMIC OF PLAGUE. 
EXTENSION OF THE DISEASE BETWEEN 1897-1917. 
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a RAS eb de Aan hh 
