EXPLANATION OF THE PLATES. 
Plates L-VIII. arc based upon the statistics given on pp. 540-566, as is stntcdon p. 539. Abscissa! 
indicate iiiontlis ; ordinutes indicate temperatures (shown by broken Hues), and also pcrccnta^ros of 
yearly typhoid-fcAxr mortality (solid lines) except in the curves for Newark, N. J. (Plate VI.), the 
Empire of India (Plate VII.), and Santiago de Chile (Plate V.), in which deaths, not cases, arc 
indicated - 
It is important to rememl)er that the curve of typhoid deaths in each case has been moved back 
exactly two months from its true position, and that for typhoid cases one mouth, as is explained on 
p. 539. 
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