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17
again receivc the contagion, which is thus supposed to
produce some change in the blood, somewhat after the
fashion in which a ferment acts upon sweetwort and
changes it into beer; hence the term, from a Greek
word Zulm, signifying yeast.
Another characteristic of these affections is that each
one breeds true; that is to say, Small Pox breeds Small
Pox; and Typhus, Typhus; the one is never communicated
from the other, and neither of them can
arise by itself.
The registered deaths from these seven diseases were
477 against 521 last year, a decrease of 44, The subjoined
table shews the mortality for the current year
contrasted with the previous one.