The first syllable is on a single note. The first leader in a composition begins on the first beat with a dotted half note or longer duration. Subsequent leaders begin with any white note on any beat. The final syllable is on a single note. As in this example, note that black notes are primarily reserved for melismatic passages.
Melismatic passages end with a white note.
When a syllable is set to a single note, it is almost always a white note. Note the leader in mm 1-2 on p74. As in this example, a repeated note usually requires a new syllable. Quarter-note anticipations are frequently used in melismatic passages, resulting in a single syllable on a repeated pitch. See p75 m14.