You mean society as Era? or do you refer to the The Stevenson American society?
        
                    
             
        
        
        
<h3><u>Two dissimilar things is Whitman comparing when he uses the metaphor of a little house:</u></h3>
The poet Walt Whiteman has talked about the perfumes or smell of anything like a metaphor. He has related the sense of smell with the memories. He has talked about the smell of a house or a room.  Also, at the same time, he has talked about the smell of books in the shelves. 
The two dissimilar things he has mentioned which were specific about the house memories. One is the smell of the house or the room and the other is the smell of the books on the shelves. All the above two things remind us about our past memories.
 
        
        
        
A sonnet structure is used because sonnets were used at that time to proclaim love and were often written to loved people. By using sonnet form instead of Shakespeare's regular blankverse he shows that there is love between them.
        
                    
             
        
        
        
Because it helps you organize your ideas and thoughts systematically and correctly before writing it in fair.You can also correct any spelling or punctuation mistakes and separate your paragraphs decently.
        
                    
             
        
        
        
Root because it is the foundation