+560.+ The hyphen is used between the parts of a compound word or at the
end of a line to indicate that a word is divided. We have so many
compound words in our language which we have used so often that we have
almost forgotten that they were compound words so it is not always easy
to decide whether the hyphen belongs in a word or not. As, for example;
we find such words as _schoolhouse_, _bookkeeper_, _railway_ and many
others which are, in reality, compound words and in the beginning were
written with the hyphen. We have used them so frequently and their use
as compound words has become so commonplace, that we no longer use the
hyphen in writing them. Yet frequently you will find them written with
the hyphen by some careful writer.
+561.+ As a general rule the parts of all words which are made by
uniting two or more words into one should be joined by hyphens, as:
Men-of-war, knee-deep, half-hearted, full-grown, mother-in-law, etc.
+562.+ The numerals expressing a compound number should be united by a
hyphen, as; _forty-two_, _twenty-seven_, _thirty-nine_, etc.
+563.+ When the word _self_ is used with an adverb, a noun or an
adjective, it is always connected by the hyphen, as; _self-confidence_,
_self-confident_, _self-confidently_, _self-command_, _self-assertive_,
_self-asserting_, etc.
+564.+ When the word _fold_ is added to a number of more than one
syllable, the hyphen is always used, as; _thirty-fold_, _forty-fold_,
_fifty-fold_, etc. If the numeral has but one syllable, do not use the
hyphen, as; _twofold_, _threefold_, _fourfold_, etc.
+565.+ When fractions are written in words instead of figures always use
the hyphen, as; _one-half_, _one-fourth_, _three-sevenths_,
_nine-twelfths_, etc.
+566.+ The words _half_ and _quarter_, when used with any word, should
be connected by a hyphen, as; _half-dollar_, _quarter-pound_,
_half-skilled_, _half-barbaric_, _half-civilized_, _half-dead_,
_half-spent_, etc.
+567.+ Sometimes we coin a phrase for temporary use in which the words
are connected by the hyphen. For example:
It was a never-to-be-forgotten day.
He wore a sort of I-told-you-so air.
They were fresh-from-the-pen copies.