After Madeline is entombed, Roderick's health becomes even worse because
Poe never really tells us what Roderick's malady is. Like the house of Usher, Roderick seems to be disintegrating, “A cadaverousness of complexion; an eye large, liquid, and luminous beyond comparison; lips somewhat thin and very pallid....." Roderick's emotional state is fragile too, "and I soon found this to arise from a series of feeble and futile struggles to overcome a habitual trepidancy - an excessive nervous agitation..." Roderick is very much a part of everything about Usher that is crumbling including his "dead" sister. His sister, the house and Roderick seem to have a symbiotic relationship. Once one begins to crumble, they all do.
a storm beats upon the house
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