"For the Fruits of His Creation"

I was looking at "For the Fruits of His Creation" last month and noticed a small feature.  The third and fourth lines of the first verse are "For His gifts to ev'ry nation, / Thanks be to God," sung to these musical phrases from the tune "Ar hyd y nos":

The phrase "ev'ry nation" is sung to notes of all different pitches (A G F# D), giving a sense of number.