▁a ▁mixture ▁of ▁these . ▁Sometimes ▁the ▁ex cret ions ▁of ▁sick ▁people ▁are ▁too ▁small ▁or ▁too ▁large , ▁or ▁a ▁particular ▁ex cret ion ▁might ▁be ▁def ic ient ▁or ▁excess ive . ▁These ▁kinds ▁of ▁ill ness es ▁are ▁sometimes ▁severe , ▁sometimes ▁chron ic , ▁sometimes ▁increasing , ▁sometimes ▁stable , ▁and ▁sometimes ▁ab ating . ▁As ▁soon ▁as ▁it ▁is ▁known ▁to ▁which ▁of ▁these ▁dise ases ▁an ▁ill ness ▁belongs , ▁if ▁the ▁body ▁is ▁bound , ▁then ▁it ▁must ▁be ▁opened ; ▁if ▁it ▁is ▁loose , ▁then ▁it ▁must ▁be ▁rest rained ; ▁if ▁it ▁is ▁complicated , ▁then ▁the ▁most ▁ur gent ▁mal ady ▁must ▁be ▁fought ▁first . ▁One ▁type ▁of ▁treatment ▁is ▁required ▁in ▁ac ute , ▁another ▁in ▁inv eter ate ▁ill ness es ; ▁another ▁when ▁dise ases ▁are ▁increasing , ▁another ▁when ▁stable , ▁and ▁another ▁when ▁decre asing . ▁The ▁observation ▁of ▁these ▁things ▁const itute ▁the ▁art ▁of ▁medicine , ▁called ▁method ▁( ). ▁ ▁As ▁the ▁seeking ▁after ▁the ▁causes ▁of ▁dise ases ▁seemed ▁to ▁Th em ison ▁to ▁rest ▁on ▁too ▁uncertain ▁a ▁foundation , ▁he ▁thus ▁wished ▁to ▁establish ▁his ▁system ▁upon ▁the ▁analog ies ▁and ▁indic ations ▁common ▁to ▁many ▁dise ases ▁( ), ▁no ▁matter ▁that ▁these ▁analog ies ▁were ▁as ▁obsc ure ▁as ▁the ▁causes ▁of ▁the ▁Dog m atic ▁school . ▁Th em ison ▁wrote ▁several ▁works ▁which ▁are ▁now ▁lost . ▁ ▁D iffer ences ▁from ▁the ▁Emp ir