The lines that have internal rhyme are:-
Line 2:-Through a little roof of glass  & Line 4:- For his agony to pass;
The placement of the rhyme within the poetic line is what distinguishes internal rhymes. Internal rhymes are distinguished from end rhymes, which include rhyming words at the ends of lines, by the placement of rhymes in the center of lines.
Middle rhyme is another term used to describe internal rhyme.
Any kind of poetry can have internal rhymes, regardless of whether the poem has a rigid rhyme system or meter. 
Poetry may have internal rhyme all throughout a line or only in some lines.
To learn more about internal rhymes here:-
brainly.com/question/7195466?referrer=searchResults
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I can't see the side paragraph but I think its a detailed desript of his thoughts.. If I recall it correctly
        
             
        
        
        
I don't have a specific answer to this question but i know its a whole lot.
i hope this will help.