what inner changes can you infer from the outer changes in usher

Certainly the House of Usher is deteriorating,

"The discoloration of ages had been great. Minute fungi overspread the whole exterior, hanging in a fine tangled web-work from the eaves. Yet all this was apart from any extraordinary dilapidation."

We can infer that the house has been unkept for a very long time meaning the people inside have been too sick (mental or physical) to allow their property to sink so low.

Which phrase from the paragraph below best supports your definition for the word "similitude"?