(i) He intends to marry a woman doctor who has plenty of money and a good medical practice. He wishes to have a fat wife so that she cannot run after him and catch him when he would make a mistake.
(ii) The person he actually marries is a thin reedy person with the gift of a sprinter.
(i) The kind of person the doctor is (money, possessions)
(ii) The kind of person he wants to be (appearance, ambition)