NoDictionaries   Text notes for  
... quis faucibus hausit, aut furit aut patitur mirum gravitate...

'furit' : drink water from that river, and either you get grazy or you'll fall asleep and will not wake up - Ovid, ofcourse, is referring to the zse-zse fly. Although the ancients didnot know yet, that the cause of this disease was the insect.