My impression was that loose iambics meant the addition of unstressed syllables into a line of IP, which can of course throw the pulse off course a little, although the line is still identifiable as basically iambic. .... Substitution is different.
Er, what exactly is the difference between "adding unstressed syllables" and "substitution" with anapests or dactyls?
I'd scan the Hecht piece thusly:
L1: IP
L2: tiiai
L3: aiiii
L4: attii
L5: iiaii
L6: tiiii
I'm out of time this morning but you get the idea.
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