should be set off by the comma.+ [Footnote: An expression in the body of a
sentence is set off by two commas; at the beginning or at the end, by one
comma.]

+Remark.+--This rule must be applied with caution. Unless it is desired to
make the phrase emphatic, or to break the continuity of the thought, the
growing usage among writers is not to set it off.

+Direction.+--_Tell why the comma is, or is not, used in these
sentences_:--

1. Between the two mountains lies a fertile valley.
2. Of the scenery along the Rhine, many travelers speak with enthusiasm.
3. He went, at the urgent request of the stranger, for the doctor.
4. He went from New York to Philadelphia on Monday.
5. In the dead of night, with a chosen band, under the cover of a truce, he
approached.

+Direction+.--_Punctuate such of these sentences as need punctuation_:--

1. England in the eleventh century was conquered by the Normans.
2. Amid the angry yells of the spectators he died.
3. For the sake of emphasis a word or a phrase may be placed out of its
natural order.
4. In the Pickwick Papers the conversation of Sam Weller is spiced with
wit.
5. New York on the contrary abounds in men of wealth.
6. It has come down by uninterrupted tradition from the earliest times to
the present day.