Y.
Y is a vowel, which, as Quintilian observes of one of the Roman letters, we might want without inconvenience, but that we have it. It supplies the place of i at the end of words, as thy, before an i, as dying; and is commonly retained in derivative words where it was part of a diphthong, in the primitive; as, destroy, destroyer; betray, betrayed, betrayer; pray, prayer; say, sayer; day, days.
Y being the Saxon vowel y, which was commonly used where i is now put, occurs very frequently in all old books.