winds　of　the　north　scarcely　touch；　must　necessarily　be　in　a　very
  unhealthy　situation：　in　the　first　place　the　waters　are　not　clear；
  the　cause　of　which　is；　because　the　mist　prevails　commonly　in　the
  morning；　and　it　is　mixed　up　with　the　water　and　destroys　its　clearness；
  for　the　sun　does　not　shine　upon　the　water　until　he　be　considerably
  raised　above　the　horizon。　And　in　summer；　cold　breezes　from　the　east
  blow　and　dews　fall；　and　in　the　latter　part　of　the　day　the　setting
  sun　particularly　scorches　the　inhabitants；　and　therefore　they　are　pale
  and　enfeebled；　and　are　partly　subject　to　all　the　aforesaid　diseases；
  but　no　one　is　peculiar　to　them。　Their　voices　are　rough　and　hoarse
  owing　to　the　state　of　the　air；　which　in　such　a　situation　is
  generally　impure　and　unwholesome；　for　they　have　not　the　northern　winds
  to　purify　it；　and　these　winds　they　have　are　of　a　very　humid　character；
  such　being　the　nature　of　the　evening　breezes。　Such　a　situation　of　a
  city　bears　a　great　resemblance　to　autumn　as　regards　the　changes　of　the
  day；　inasmuch　as　the　difference　between　morning　and　evening　is
  great。　So　it　is　with　regard　to　the　winds　that　are　conducive　to　health；
  or　the　contrary。
  7。　And　I　wish　to　give　an　account　of　the　other　kinds　of　waters；
  namely；　of　such　as　are　wholesome　and　such　as　are　unwholesome；　and　what
  bad　and　what　good　effects　may　be　derived　from　water；　for　water
  contributes　much　towards　health。　Such　waters　then　as　are　marshy；
  stagnant；　and　belong　to　lakes；　are　necessarily　hot　in　summer；　thick；
  and　have　a　strong　smell；　since　they　have　no　current；　but　being
  constantly　supplied　by　rain…water；　and　the　sun　heating　them；　they
  necessarily　want　their　proper　color；　are　unwholesome　and　form　bile；　in
  winter；　they　become　congealed；　cold；　and　muddy　with　the　snow　and
  ice；　so　that　they　are　most　apt　to　engender　phlegm；　and　bring　on
  hoarseness；　those　who　drink　them　have　large　and　obstructed　spleens；
  their　bellies　are　hard；　emaciated；　and　hot；　and　their　shoulders；
  collar…bones；　and　faces　are　emaciated；　for　their　flesh　is　melted
  down　and　taken　up　by　the　spleen；　and　hence　they　are　slender；　such
  persons　then　are　voracious　and　thirsty；　their　bellies　are　very　dry
  both　above　and　below；　so　that　they　require　the　strongest　medicines。
  This　disease　is　habitual　to　them　both　in　summer　and　in　winter；　and
  in　addition　they　are　very　subject　to　dropsies　of　a　most　fatal
  character；　and　in　summer　dysenteries；　diarrheas；　and　protracted
  quartan　fevers　frequently　seize　them；　and　these　diseases　when
  prolonged　dispose　such　constitutions　to　dropsies；　and　thus　prove
  fatal。　These　are　the　diseases　which　attack　them　in　summer；　but　in
  winter　younger　persons　are　liable　to　pneumonia；　and　maniacal
  affections；　and　older　persons　to　ardent　fevers；　from　hardness　of　the
  belly。　Women　are　subject　to　oedema　and　leucophlegmasiae；　when　pregnant
  they　have　difficult　deliveries；　their　infants　are　large　and　swelled；
  and　then　during　nursing　they　become　wasted　and　sickly；　and　the　lochial
  discharge　after　parturition　does　not　proceed　properly　with　the
  women。　The　children　are　particularly　subject　to　hernia；　and　adults
  to　varices　and　ulcers　on　their　legs；　so　that　persons　with　such
  constitutions　cannot　be　long…lived；　but　before　the　usual　period　they
  fall　into　a　state　of　premature　old　age。　And　further；　the　women
  appear　to　be　with　child；　and　when　the　time　of　parturition　arrives；　the
  fulness　of　the　belly　disappears；　and　this　happens　from　dropsy　of　the
  uterus。　Such　waters　then　I　reckon　bad　for　every　purpose。　The　next　to
  them　in　badness　are　those　which　have　their　fountains　in　rocks；　so　that
  they　must　necessarily　be　hard；　or　come　from　a　soil　which　produces
  thermal　waters；　such　as　those　having　iron；　copper；　silver；　gold；
  sulphur；　alum；　bitumen；　or　nitre　（soda）　in　them；　for　all　these　are
  formed　by　the　force　of　heat。　Good　waters　cannot　proceed　from　such　a
  soil；　but　those　that　are　hard　and　of　a　heating　nature；　difficult　to
  pass　by　urine；　and　of　difficult　evacuation　by　the　bowels。　The　best　are
  those　which　flow　from　elevated　grounds；　and　hills　of　earth；　these
  are　sweet；　clear；　and　can　bear　a　little　wine；　they　are　hot　in　summer
  and　cold　in　winter；　for　such　necessarily　must　be　the　waters　from
  deep　wells。　But　those　are　most　to　be　commended　which　run　to　the　rising
  of　the　sun；　and　especially　to　the　summer　sun；　for　such　are　necessarily
  more　clear；　fragrant；　and　light。　But　all　such　as　are　salty；　crude；　and
  harsh；　are　not　good　for　drink。　But　there　are　certain　constitutions　and
  diseases　with　which　such　waters　agree　when　drunk；　as　I　will　explain
  presently。　Their　characters　are　as　follows：　the　best　are　such　as
  have　their　fountains　to　the　east；　the　next；　those　between　the　summer
  risings　and　settings　of　the　sun；　and　especially　those　to　the
  risings；　and　third；　those　between　the　summer　and　winter　settings；
  but　the　worst　are　those　to　the　south；　and　the　parts　between　the　winter
  rising　and　setting；　and　those　to　the　south　are　very　bad；　but　those
  to　the　north　are　better。　They　are　to　be　used　as　follows：　whoever　is　in
  good　health　and　strength　need　not　mind；　but　may　always　drink
  whatever　is　at　hand。　But　whoever　wishes　to　drink　the　most　suitable　for
  any　disease；　may　accomplish　his　purpose　by　attending　to　the
  following　directions：　To　persons　whose　bellies　are　hard　and　easily
  burnt　up；　the　sweetest；　the　lightest；　and　the　most　limpid　waters
  will　be　proper；　but　those　persons　whose　bellies　are　soft；　loose；　and
  pituitous；　should　choose　the　hardest；　those　kinds　that　are　most　crude；
  and　the　saltiest；　for　thus　will　they　be　most　readily　dried　up；　for
  such　waters　as　are　adapted　for　boiling；　and　are　of　a　very　solvent
  nature；　naturally　loosen　readily　and　melt　down　the　bowels；　but　such　as
  are　intractable；　hard；　and　by　no　means　proper　for　boiling；　these
  rather　bind　and　dry　up　the　bowels。　People　have　deceived　themselves
  with　regard　to　salt　waters；　from　inexperience；　for　they　think　these
  waters　purgative；　whereas　they　are　the　very　reverse；　for　such　waters
  are　crude；　and　ill　adapted　for　boiling；　so　that　the　belly　is　more
  likely　to　be　bound　up　than　loosened　by　them。　And　thus　it　is　with
  regard　to　the　waters　of　springs。
  8。　I　will　now　tell　how　it　is　with　respect　to　rain…water；　and　water
  from　snow。　Rain　waters；　then；　are　the　lightest；　the　sweetest；　the
  thinnest；　and　the　clearest；　for　originally　the　sun　raises　and　attracts
  the　thinnest　and　lightest　part　of　the　water；　as　is　obvious　from　the
  nature　of　salts；　for　the　saltish　part　is　left　behind　owing　to　its
  thickness　and　weight；　and　forms　salts；　but　the　sun　attracts　the
  thinnest　part；　owing　to　its　lightness；　and　he　abstracts　this　not
  only　from　the　lakes；　but　also　from　the　sea；　and　from　all　things
  which　contain　humidity；　and　there　is　humidity　in　everything；　and
  from　man　himself　the　sun　draws　off　the　thinnest　and　lightest　part　of
  the　juices。　As　a　strong　proof　of　this；　when　a　man　walks　in　the　sun；　or
  sits　down　having　a　garment　on；　whatever　parts　of　the　body　the　sun
  shines　upon　do　not　sweat；　for　the　sun　carries　off　whatever　sweat　makes
  its　appearance；　but　those　parts　which　are　covered　by　the　garment；　or
  anything　else；　sweat；　for　the　particles　of　sweat　are　drawn　and
  forced　out　by　the　sun；　and　are　preserved　by　the　cover　so　as　not　to
  be　dissipated　by　the　sun；　but　when　the　person　comes　into　the　shade　the
  whole　body　equally　perspires；　because　the　sun　no　longer　shines　upon
  it。　Wherefore；　of　all　kinds　of　water；　these　spoil　the　soonest；　and
  rain　water　has　a　bad　spot　smell；　because　its　particles　are　collected
  and　mixed　together　from　most　objects；　so　as　to　spoil　the　soonest。
  And　in　addition　to　this；　when　attracted　and　raised　up；　being　carried
  about　and　mixed　with　the　air；　whatever　part　of　it　is　turbid　and
  darkish　is　separated　and　removed　from　the　other；　and　becomes　cloud　and
  mist；　but　the　most　attenuated　and　lightest　part　is　left；　and　becomes
  sweet；　being　heated　and　concocted　by　the　sun；　for　all　other　things
  when　concocted　become　sweet。　While　dissipated　then　and　not　in　a
  state　of　consistence　it　is　carried　aloft。　But　when　collected　and
  condensed　by　contrary　winds；　it　falls　down　wherever　it　happens　to　be
  most　condensed。　For　this　is　likely　to　happen　when　the　clouds　being
  carried　along　and　moving　with　a　wind　which　does　not　allow　them　to
  rest；　suddenly　encounters　another　wind　and　other　clouds　from　the
  opposite　direction：　there　it　is　first　condensed；　and　what　is　behind　is
  carried　up　to　the　spot；　and　thus　it　thickens；　blackens；　and　is
  conglomerated；　and　by　its　weight　it　falls　down　and　becomes　rain。　Such；
  to　all　appearance；　are　the　best　of　waters；　but　they　require　to　be
  boiled　and　strained；　for　otherwise　they　have　a　bad　smell；　and　occasion
  hoarseness　and　thickness　of　the　voice　to　those　who　drink　them。　Those
  from　snow　and　ice　are　all　bad；　for　when　once　congealed；　they　never
  again　recover　their　former　nature；　for　whatever　is　clear；　light；　and
  sweet　in　them；　is　separated　and　disappears；　but　the　most　turbid　and
  weightiest　part　is　left　behind。　You　may　ascertain　this　in　the
  following　manner：　If　in　winter　you　will　pour　water　by　measure　into　a
  vessel　and　expose　it　to　the　open　air　until　it　is　all　frozen；　and
  then　on　the　following　day　bring　it　into　a　warm　situation　where　the　ice
  will　thaw；　if　you　will　measure　the　water　again　when　dissolv