already referred to in the mass: "The boy's excuses for being late were:
firstly, he did not know the time, secondly, he was sent on an errand,
thirdly, he tripped on a rock and fell by the wayside."


The _Period_ is the simplest punctuation mark. It is simply used to mark
the end of a complete sentence that is neither interrogative nor
exclamatory.

(1) After every sentence conveying a complete meaning: "Birds fly."
"Plants grow." "Man is mortal."

(2) In abbreviations: after every abbreviated word: Rt. Rev. T. C.
Alexander, D.D., L.L.D.

(3) A period is used on the title pages of books after the name of the
book, after the author's name, after the publisher's imprint: _American
Trails_. By Theodore Roosevelt. New York. Scribner Company.


The _Mark of Interrogation_ is used to ask or suggest a question.

(1) Every question admitting of an answer, even when it is not expected,
should be followed by the mark of interrogation: "Who has not heard of
Napoleon?"

(2) When several questions have a common dependence they should be
followed by one mark of interrogation at the end of the series: "Where
now are the playthings and friends of my boyhood; the laughing boys; the
winsome girls; the fond neighbors whom I loved?"