When the riuer of Tygris is well replenished with water, you may passe from Babylon to Basora in eight or nine dayes, and sometimes more and sometimes lesse: we were halfe so much more which is 14 or 15 daies, because the waters were low: they may saile day and night, and there are some places in this way where you pay so many medins on a baile: if the waters be lowe, it is 18 dayes iourney.