What does the word “this” in the last line refer to?
“THIS”REFERS TO THE POEM. A NICE SUMMER'S DAY IS USUALLY TRANSIENT, BUT THE BEAUTY IN POETRY CAN LAST FOR EVER. 
What does the word “this” in the last line refer to?
“THIS”REFERS TO THE POEM. A NICE SUMMER'S DAY IS USUALLY TRANSIENT, BUT THE BEAUTY IN POETRY CAN LAST FOR EVER.