XXVI. When the exacerbations are on even days,
the crises are on even days. But the diseases exacerbated
on odd days have their crises on odd days.
The first period of diseases with crises on the even
days is the fourth day, then the sixth, eighth, tenth,
fourteenth, twentieth, twenty-fourth, thirtieth,
fortieth, sixtieth, eightieth, hundred and twentieth.
Of those with a crisis on the odd days the first period
is the third, then the fifth, seventh, ninth, eleventh,
seventeenth, twenty-first, twenty-seventh, thirty-first.
Further, one must know that, if the crises
be on other days than the above, there will be
relapses, and there may also be a fatal issue. So
one must be attentive and know that at these times
there will be the crises resulting in recovery, or
death, or a tendency for better or worse. One must
also consider in what periods the crises occur of
irregular fevers, of quartans, of quintans, of septans
and of nonans.