BOTH DIAGRAMS EMPLOYED.
. i.e. All well-fed birds are happy.
. i.e. Some birds that are not well-fed, are unhappy; or, Some unhappy birds are not well-fed.
. i.e. John has got a tooth-ache.
. i.e. No one, but John, has got a tooth-ache.
. i.e. Some one, who has taken a walk, feels better.
. i.e. Some one, whom I sent to bring me a kitten, brought me a kettle by mistake.
[See p. 52]