Analysis of A Strange Wild Song

He thought he saw an Elephant
That practised on a fife:
He looked again, and found it was
A letter from his wife.
"At length I realize," he said,
"The bitterness of life!"

He thought he saw a Buffalo
Upon the chimney-piece:
He looked again, and found it was
His Sister's Husband's Niece.
"Unless you leave this house," he said,
"I'll send for the police!"

he thought he saw a Rattlesnake
That questioned him in Greek:
He looked again, and found it was
The Middle of Next Week.
"The one thing I regret," he said,
"Is that it cannot speak!"

He thought he saw a Banker's Clerk
Descending from the bus:
He looked again, and found it was
A Hippopotamus.
"If this should stay to dine," he said,
"There won't be much for us!"

He thought he saw a Kangaroo
That worked a Coffee-mill:
He looked again, and found it was
A Vegetable-Pill.
"Were I to swallow this," he said,
"I should be very ill!"

He thought he saw a Coach-and-Four
That stood beside his bed:
He looked again, and found it was
A Bear without a Head.
"Poor thing," he said, "poor silly thing!
It's waiting to be fed!"